Add settings, cloud places, and optional archive-content indexing.

Keep official clients in charge of sync while Explorer can group locations, persist UI prefs, and list zip/rar/7z members without extracting them.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -19,6 +19,7 @@ TestResults/
 *.coverage
 *.nupkg
 project.lock.json
+publish/
 
 ## IDE
 .idea/
@@ -35,3 +36,4 @@ Desktop.ini
 *.db-shm
 *.db-wal
 *.log
+

Explorer.slnx

@@ -8,6 +8,8 @@
     <Project Path="src/Explorer.FileOperations/Explorer.FileOperations.csproj" />
     <Project Path="src/Explorer.Indexing/Explorer.Indexing.csproj" />
     <Project Path="src/Explorer.Plugin.Abstractions/Explorer.Plugin.Abstractions.csproj" />
+    <Project Path="src/Explorer.Plugin.GoogleDrive/Explorer.Plugin.GoogleDrive.csproj" />
+    <Project Path="src/Explorer.Plugin.Nextcloud/Explorer.Plugin.Nextcloud.csproj" />
     <Project Path="src/Explorer.Plugin.OneDrive/Explorer.Plugin.OneDrive.csproj" />
     <Project Path="src/Explorer.Presentation/Explorer.Presentation.csproj" />
     <Project Path="src/Explorer.Search/Explorer.Search.csproj" />

docs/ARCHITECTURE.md

@@ -353,7 +353,7 @@ Windows-NFS-Client (optional Feature) erscheint als Laufwerk oder Mount. Behande
 
 ### 5.4 Cloud (Plugin-Overlay)
 
-Explorer **implementiert keine Synchronisation**. Offizielle Clients (OneDrive, später Google Drive / Dropbox) bleiben zuständig für Sync, Hydration, Konflikte und Anmeldung.
+Explorer **implementiert keine Synchronisation**. Offizielle Clients (OneDrive, Google Drive, Nextcloud; später Dropbox) bleiben zuständig für Sync, Hydration, Konflikte und Anmeldung.
 
 Cloud-Ordner werden wie jedes andere gemountete Dateisystem über Win32 gelistet. `Explorer.Plugin.Abstractions` / `IStorageProvider` **reichern** Einträge an (Status, logische vs. allokierte Größe, Pin/Free-up), sie **ersetzen nicht** Enumeration, Watcher oder Source-Identität.
 
@@ -763,7 +763,7 @@ Ziel-SLO (Richtwerte, kein Contract):
 - Historien-Charts (Schema ja)
 - Pause/Resume Transfers, Konflikt-UI, Undo
 - Icon-View, Treemap, Preview-Pane
-- Weitere Cloud-Provider (Google Drive, Dropbox) und PluginHost/IPC
+- Weitere Cloud-Provider (Dropbox) und PluginHost/IPC
 - Explorer.exe ersetzen
 - Volltext in Dateiinhalten
 

src/Explorer.Analysis/DuplicateAndHistory.cs

@@ -42,6 +42,12 @@ public sealed class DuplicateHashWorker : BackgroundService
             var path = PathRules.Combine(item.RootPath, item.PathRel);
             try
             {
+                if (!File.Exists(path))
+                {
+                    await _store.Hashes.MarkSkippedAsync(item.EntryId, cancellationToken).ConfigureAwait(false);
+                    continue;
+                }
+
                 if (_hydration.WouldHydrateOnRead(item.Attributes, item.CloudAvailability)
                     || await _hydration.WouldHydrateOnReadAsync(path, cancellationToken).ConfigureAwait(false))
                 {

src/Explorer.App/App.xaml

@@ -228,6 +228,15 @@
           </Trigger>
         </Style.Triggers>
       </Style>
+      <Style x:Key="ToolbarIconButton" TargetType="Button" BasedOn="{StaticResource {x:Type Button}}">
+        <Setter Property="Width" Value="36"/>
+        <Setter Property="MinWidth" Value="36"/>
+        <Setter Property="Height" Value="32"/>
+        <Setter Property="Padding" Value="0"/>
+        <Setter Property="FontFamily" Value="{StaticResource Symbol}"/>
+        <Setter Property="FontSize" Value="16"/>
+        <Setter Property="Margin" Value="0,0,4,0"/>
+      </Style>
       <Style TargetType="TextBox">
         <Setter Property="Foreground" Value="{DynamicResource Fg}"/>
         <Setter Property="Background" Value="{DynamicResource InputBg}"/>
@@ -360,6 +369,15 @@
         <Setter Property="Foreground" Value="{DynamicResource Fg}"/>
         <Setter Property="VerticalAlignment" Value="Center"/>
       </Style>
+      <Style TargetType="RadioButton">
+        <Setter Property="Foreground" Value="{DynamicResource Fg}"/>
+        <Setter Property="VerticalAlignment" Value="Center"/>
+      </Style>
+      <Style TargetType="Menu">
+        <Setter Property="Background" Value="{DynamicResource Panel}"/>
+        <Setter Property="Foreground" Value="{DynamicResource Fg}"/>
+        <Setter Property="FontSize" Value="13"/>
+      </Style>
       <Style TargetType="ContextMenu">
         <Setter Property="Background" Value="{DynamicResource Panel}"/>
         <Setter Property="Foreground" Value="{DynamicResource Fg}"/>
@@ -398,7 +416,11 @@
           <Setter.Value>
             <ControlTemplate TargetType="MenuItem">
               <Border x:Name="Bd" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}">
-                <ContentPresenter ContentSource="Header" RecognizesAccessKey="True"/>
+                <DockPanel>
+                  <TextBlock DockPanel.Dock="Right" Text="{TemplateBinding InputGestureText}"
+                             Foreground="{DynamicResource FgMuted}" Margin="24,0,0,0" VerticalAlignment="Center"/>
+                  <ContentPresenter ContentSource="Header" RecognizesAccessKey="True" VerticalAlignment="Center"/>
+                </DockPanel>
               </Border>
               <ControlTemplate.Triggers>
                 <Trigger Property="IsHighlighted" Value="True">
@@ -411,6 +433,58 @@
             </ControlTemplate>
           </Setter.Value>
         </Setter>
+        <Style.Triggers>
+          <Trigger Property="Role" Value="TopLevelHeader">
+            <Setter Property="Padding" Value="10,6"/>
+            <Setter Property="Template">
+              <Setter.Value>
+                <ControlTemplate TargetType="MenuItem">
+                  <Border x:Name="Bd" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}">
+                    <Grid>
+                      <ContentPresenter ContentSource="Header" RecognizesAccessKey="True" VerticalAlignment="Center"/>
+                      <Popup x:Name="PART_Popup"
+                             IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}"
+                             Placement="Bottom"
+                             AllowsTransparency="True"
+                             Focusable="False"
+                             PopupAnimation="Fade">
+                        <Border MinWidth="180" Background="{DynamicResource Panel}"
+                                BorderBrush="{DynamicResource Stroke}" BorderThickness="1" Padding="4">
+                          <StackPanel IsItemsHost="True"/>
+                        </Border>
+                      </Popup>
+                    </Grid>
+                  </Border>
+                  <ControlTemplate.Triggers>
+                    <Trigger Property="IsHighlighted" Value="True">
+                      <Setter TargetName="Bd" Property="Background" Value="{DynamicResource FillHover}"/>
+                    </Trigger>
+                    <Trigger Property="IsSubmenuOpen" Value="True">
+                      <Setter TargetName="Bd" Property="Background" Value="{DynamicResource FillHover}"/>
+                    </Trigger>
+                  </ControlTemplate.Triggers>
+                </ControlTemplate>
+              </Setter.Value>
+            </Setter>
+          </Trigger>
+          <Trigger Property="Role" Value="TopLevelItem">
+            <Setter Property="Padding" Value="10,6"/>
+            <Setter Property="Template">
+              <Setter.Value>
+                <ControlTemplate TargetType="MenuItem">
+                  <Border x:Name="Bd" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}">
+                    <ContentPresenter ContentSource="Header" RecognizesAccessKey="True" VerticalAlignment="Center"/>
+                  </Border>
+                  <ControlTemplate.Triggers>
+                    <Trigger Property="IsHighlighted" Value="True">
+                      <Setter TargetName="Bd" Property="Background" Value="{DynamicResource FillHover}"/>
+                    </Trigger>
+                  </ControlTemplate.Triggers>
+                </ControlTemplate>
+              </Setter.Value>
+            </Setter>
+          </Trigger>
+        </Style.Triggers>
       </Style>
       <Style TargetType="ProgressBar">
         <Setter Property="Height" Value="4"/>

src/Explorer.App/AppServices.cs

@@ -5,6 +5,8 @@ using Explorer.Domain.Abstractions;
 using Explorer.FileOperations;
 using Explorer.Indexing;
 using Explorer.Plugin.Abstractions;
+using Explorer.Plugin.GoogleDrive;
+using Explorer.Plugin.Nextcloud;
 using Explorer.Plugin.OneDrive;
 using Explorer.Presentation.ViewModels;
 using Explorer.Search;
@@ -34,11 +36,16 @@ public static class AppServices
             return new SqliteIndexStore(env.DatabasePath, logger);
         });
         services.AddSingleton<IStorageProvider, OneDriveStorageProvider>();
+        services.AddSingleton<IStorageProvider, GoogleDriveStorageProvider>();
+        services.AddSingleton<IStorageProvider, NextcloudStorageProvider>();
         services.AddSingleton<StorageProviderRegistry>();
         services.AddSingleton<IHydrationGuard, HydrationGuard>();
         services.AddSingleton<SourceManager>();
         services.AddSingleton<PathHistoryStore>();
         services.AddSingleton<CloudPlaceStore>();
+        services.AddSingleton<UiPreferencesStore>();
+        services.AddSingleton<IArchiveCatalog, ArchiveCatalog>();
+        services.AddSingleton<ArchiveContentsIndexer>();
         services.AddSingleton<BrowseService>();
         services.AddSingleton<FilesystemScanner>();
         services.AddSingleton<FolderReconciler>();

src/Explorer.App/Explorer.App.csproj

@@ -29,6 +29,8 @@
     <ProjectReference Include="..\Explorer.FileOperations\Explorer.FileOperations.csproj" />
     <ProjectReference Include="..\Explorer.Indexing\Explorer.Indexing.csproj" />
     <ProjectReference Include="..\Explorer.Plugin.Abstractions\Explorer.Plugin.Abstractions.csproj" />
+    <ProjectReference Include="..\Explorer.Plugin.GoogleDrive\Explorer.Plugin.GoogleDrive.csproj" />
+    <ProjectReference Include="..\Explorer.Plugin.Nextcloud\Explorer.Plugin.Nextcloud.csproj" />
     <ProjectReference Include="..\Explorer.Plugin.OneDrive\Explorer.Plugin.OneDrive.csproj" />
     <ProjectReference Include="..\Explorer.Presentation\Explorer.Presentation.csproj" />
     <ProjectReference Include="..\Explorer.Search\Explorer.Search.csproj" />

src/Explorer.App/MainWindow.xaml

@@ -41,6 +41,32 @@
         </StackPanel>
       </Grid>
     </Border>
+    <Menu DockPanel.Dock="Top" Background="{DynamicResource Panel}" Foreground="{DynamicResource Fg}"
+          BorderBrush="{DynamicResource Stroke}" BorderThickness="0,0,0,1" Padding="4,0">
+      <MenuItem Header="_File">
+        <MenuItem Header="New _tab" InputGestureText="Ctrl+T" Command="{Binding NewTabCommand}"/>
+        <MenuItem Header="_Split pane" Command="{Binding SplitCommand}"/>
+        <MenuItem Header="_Close tab" InputGestureText="Ctrl+W" Command="{Binding CloseTabCommand}" CommandParameter="{Binding ActiveTab}"/>
+      </MenuItem>
+      <MenuItem Header="_View">
+        <MenuItem Header="_Details" Command="{Binding SetViewCommand}" CommandParameter="Details"/>
+        <MenuItem Header="_List" Command="{Binding SetViewCommand}" CommandParameter="List"/>
+        <MenuItem Header="_Preview" Command="{Binding SetViewCommand}" CommandParameter="Preview"/>
+        <Separator/>
+        <MenuItem Header="_Refresh" InputGestureText="F5" Command="{Binding RefreshCommand}"/>
+      </MenuItem>
+      <MenuItem Header="_Tools">
+        <MenuItem Header="_Index this location" Command="{Binding BuildIndexCommand}"/>
+        <MenuItem Header="_Storage" Command="{Binding Analysis.OpenCommand}"/>
+        <MenuItem Header="_Duplicates" Command="{Binding Duplicates.OpenCommand}"/>
+        <Separator/>
+        <MenuItem Header="Add _network…" Click="OnAddNetwork"/>
+        <MenuItem Header="Add One_Drive…" Click="OnAddOneDrive"/>
+        <MenuItem Header="Add _Google Drive…" Click="OnAddGoogleDrive"/>
+        <MenuItem Header="Add Ne_xtcloud…" Click="OnAddNextcloud"/>
+      </MenuItem>
+      <MenuItem Header="_Settings" Click="OnOpenSettings"/>
+    </Menu>
     <Border DockPanel.Dock="Top" Background="{DynamicResource Panel}" BorderBrush="{DynamicResource Stroke}" BorderThickness="0,0,0,1" Padding="8">
       <Grid>
         <Grid.ColumnDefinitions>
@@ -54,12 +80,49 @@
           <Button Content="→" Command="{Binding ForwardCommand}" Width="36" Margin="0,0,4,0" ToolTip="Forward (Alt+Right)"/>
           <Button Content="↑" Command="{Binding UpCommand}" Width="36" Margin="0,0,4,0" ToolTip="Up (Alt+Up)"/>
           <Button Content="↻" Command="{Binding RefreshCommand}" Width="36" Margin="0,0,12,0" ToolTip="Refresh (F5)"/>
-          <Button Content="New tab" Command="{Binding NewTabCommand}" Margin="0,0,4,0"/>
+          <Button Style="{StaticResource ToolbarIconButton}" Content="&#xE8C8;"
-          <Button Content="Split" Command="{Binding SplitCommand}" Margin="0,0,4,0"/>
+                  Command="{Binding NewTabCommand}" ToolTip="New tab (Ctrl+T)"/>
-          <Button Content="Index" Command="{Binding BuildIndexCommand}" Margin="0,0,4,0"/>
+          <Button Style="{StaticResource ToolbarIconButton}" Content="&#xE89F;"
-          <Button Content="Details" Command="{Binding SetViewCommand}" CommandParameter="Details" Margin="8,0,4,0"/>
+                  Command="{Binding SplitCommand}" ToolTip="Split pane"/>
-          <Button Content="List" Command="{Binding SetViewCommand}" CommandParameter="List" Margin="0,0,4,0"/>
+          <Button Style="{StaticResource ToolbarIconButton}" Content="&#xE721;"
-          <Button Content="Preview" Command="{Binding SetViewCommand}" CommandParameter="Preview"/>
+                  Command="{Binding BuildIndexCommand}" ToolTip="Index this location"/>
+          <Border Width="1" Height="18" Margin="4,0,8,0" VerticalAlignment="Center" Background="{DynamicResource Stroke}"/>
+          <Button Content="&#xE8EC;"
+                  Command="{Binding SetViewCommand}" CommandParameter="Details" ToolTip="Details">
+            <Button.Style>
+              <Style TargetType="Button" BasedOn="{StaticResource ToolbarIconButton}">
+                <Style.Triggers>
+                  <DataTrigger Binding="{Binding ActivePane.ViewMode}" Value="Details">
+                    <Setter Property="Background" Value="{DynamicResource FillHover}"/>
+                  </DataTrigger>
+                </Style.Triggers>
+              </Style>
+            </Button.Style>
+          </Button>
+          <Button Content="&#xE8FD;"
+                  Command="{Binding SetViewCommand}" CommandParameter="List" ToolTip="List">
+            <Button.Style>
+              <Style TargetType="Button" BasedOn="{StaticResource ToolbarIconButton}">
+                <Style.Triggers>
+                  <DataTrigger Binding="{Binding ActivePane.ViewMode}" Value="List">
+                    <Setter Property="Background" Value="{DynamicResource FillHover}"/>
+                  </DataTrigger>
+                </Style.Triggers>
+              </Style>
+            </Button.Style>
+          </Button>
+          <Button Content="&#xE8B9;"
+                  Command="{Binding SetViewCommand}" CommandParameter="Preview" ToolTip="Preview">
+            <Button.Style>
+              <Style TargetType="Button" BasedOn="{StaticResource ToolbarIconButton}">
+                <Style.Triggers>
+                  <DataTrigger Binding="{Binding ActivePane.ViewMode}" Value="Preview">
+                    <Setter Property="Background" Value="{DynamicResource FillHover}"/>
+                  </DataTrigger>
+                </Style.Triggers>
+              </Style>
+            </Button.Style>
+          </Button>
         </StackPanel>
         <ComboBox Grid.Column="1" Margin="12,0" Style="{StaticResource PathComboBox}"
                   ItemsSource="{Binding PathHistory}"
@@ -69,8 +132,7 @@
         <TextBox Grid.Column="2" Text="{Binding Search.Text, UpdateSourceTrigger=PropertyChanged}"
                  KeyDown="OnSearchKeyDown"/>
         <StackPanel Grid.Column="3" Orientation="Horizontal" Margin="8,0,0,0">
-          <Button Content="Search" Command="{Binding SearchCommand}" Margin="0,0,4,0"/>
+          <Button Content="Search" Command="{Binding SearchCommand}"/>
-          <Button Content="Theme" Command="{Binding ToggleThemeCommand}"/>
         </StackPanel>
       </Grid>
     </Border>
@@ -102,7 +164,9 @@
           <Button Content="Storage" Command="{Binding Analysis.OpenCommand}" Margin="0,0,6,0"/>
           <Button Content="Duplicates" Command="{Binding Duplicates.OpenCommand}" Margin="0,0,6,0"/>
           <Button Content="Add network" Click="OnAddNetwork" Margin="0,0,6,0"/>
-          <Button Content="Add OneDrive" Click="OnAddOneDrive"/>
+          <Button Content="Add OneDrive" Click="OnAddOneDrive" Margin="0,0,6,0"/>
+          <Button Content="Add Google Drive" Click="OnAddGoogleDrive" Margin="0,0,6,0"/>
+          <Button Content="Add Nextcloud" Click="OnAddNextcloud"/>
         </StackPanel>
       </Grid>
     </Border>
@@ -118,7 +182,13 @@
         <TreeView x:Name="NavTree" ItemsSource="{Binding Tree.Roots}"
                   SelectedItemChanged="OnTreeSelected"
                   TreeViewItem.Expanded="OnTreeExpanded"
+                  ContextMenuOpening="OnTreeContextOpening"
                   HorizontalContentAlignment="Stretch">
+          <TreeView.ContextMenu>
+            <ContextMenu>
+              <MenuItem x:Name="RemoveLocationMenu" Header="Remove from Explorer" Click="OnRemoveLocation"/>
+            </ContextMenu>
+          </TreeView.ContextMenu>
           <TreeView.ItemTemplate>
             <HierarchicalDataTemplate ItemsSource="{Binding Children}">
               <StackPanel Orientation="Horizontal">
@@ -206,6 +276,9 @@
                           <Separator/>
                           <MenuItem Header="Refresh" Command="{Binding DataContext.RefreshCommand, RelativeSource={RelativeSource AncestorType=Window}}"/>
                           <MenuItem Header="Rescan folder" Command="{Binding DataContext.RescanFolderCommand, RelativeSource={RelativeSource AncestorType=Window}}"/>
+                          <Separator Visibility="{Binding DataContext.ShowForgetSource, RelativeSource={RelativeSource AncestorType=Window}, Converter={StaticResource BoolVis}}"/>
+                          <MenuItem Header="Remove from Explorer" Click="OnRemoveLocation"
+                                    Visibility="{Binding DataContext.ShowForgetSource, RelativeSource={RelativeSource AncestorType=Window}, Converter={StaticResource BoolVis}}"/>
                           <Separator Visibility="{Binding DataContext.ShowCloudPin, RelativeSource={RelativeSource AncestorType=Window}, Converter={StaticResource BoolVis}}"/>
                           <MenuItem Header="Always keep on this device"
                                     Command="{Binding DataContext.PinCloudCommand, RelativeSource={RelativeSource AncestorType=Window}}"

src/Explorer.App/MainWindow.xaml.cs

@@ -3,6 +3,7 @@ using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Controls.Primitives;
 using System.Windows.Input;
+using System.Windows.Media;
 using Explorer.Domain;
 using Explorer.Presentation;
 using Explorer.Presentation.ViewModels;
@@ -129,6 +130,70 @@ public partial class MainWindow : Window
         }
     }
 
+    private void OnTreeContextOpening(object sender, ContextMenuEventArgs e)
+    {
+        var node = FindTreeNode(e.OriginalSource as DependencyObject);
+        if (node is null || !node.CanRemove)
+        {
+            e.Handled = true;
+            return;
+        }
+
+        node.IsSelected = true;
+        RemoveLocationMenu.Tag = node.Path;
+    }
+
+    private async void OnRemoveLocation(object sender, RoutedEventArgs e)
+    {
+        var path = (sender as FrameworkElement)?.Tag as string
+                   ?? RemoveLocationMenu.Tag as string
+                   ?? Vm.ActivePane.SelectedItems.FirstOrDefault()?.FullPath
+                   ?? (Vm.Tree.Roots.SelectMany(FlattenTree).FirstOrDefault(n => n.IsSelected && n.CanRemove)?.Path);
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return;
+        }
+
+        var label = Vm.Tree.Roots.SelectMany(FlattenTree).FirstOrDefault(n => NavigationTreeViewModel.PathsEqual(n.Path, path))?.Label
+                    ?? path;
+        var confirm = MessageBox.Show(
+            this,
+            $"Remove “{label}” from Explorer?\n\nThe link and its index data will be deleted. Files on disk or the server are not touched.\n\nIf Windows still has this location, it will appear again.",
+            "Remove from Explorer",
+            MessageBoxButton.YesNo,
+            MessageBoxImage.Question);
+        if (confirm != MessageBoxResult.Yes)
+        {
+            return;
+        }
+
+        await Vm.ForgetSourceAsync(path).ConfigureAwait(true);
+    }
+
+    private static IEnumerable<NavNodeViewModel> FlattenTree(NavNodeViewModel node)
+    {
+        yield return node;
+        foreach (var child in node.Children.Where(c => !c.IsPlaceholder).SelectMany(FlattenTree))
+        {
+            yield return child;
+        }
+    }
+
+    private static NavNodeViewModel? FindTreeNode(DependencyObject? origin)
+    {
+        while (origin is not null)
+        {
+            if (origin is TreeViewItem { DataContext: NavNodeViewModel node })
+            {
+                return node;
+            }
+
+            origin = origin is Visual ? VisualTreeHelper.GetParent(origin) : LogicalTreeHelper.GetParent(origin);
+        }
+
+        return null;
+    }
+
     private async void OnTreeExpanded(object sender, RoutedEventArgs e)
     {
         if (e.OriginalSource is TreeViewItem { DataContext: NavNodeViewModel node })
@@ -442,6 +507,13 @@ public partial class MainWindow : Window
         }
     }
 
+    private async void OnOpenSettings(object sender, RoutedEventArgs e)
+    {
+        var dlg = new SettingsWindow(Vm) { Owner = this };
+        dlg.ShowDialog();
+        await Vm.RefreshForgetActionAsync().ConfigureAwait(true);
+    }
+
     private void OnAddNetwork(object sender, RoutedEventArgs e)
     {
         var path = PromptWindow.Ask(this, "Add network location", "Network path (\\\\server\\share):", @"\\");
@@ -453,10 +525,19 @@ public partial class MainWindow : Window
     }
 
     private async void OnAddOneDrive(object sender, RoutedEventArgs e)
+        => await AddCloudFolderAsync("Add OneDrive folder", MainViewModel.OneDriveProviderId).ConfigureAwait(true);
+
+    private async void OnAddGoogleDrive(object sender, RoutedEventArgs e)
+        => await AddCloudFolderAsync("Add Google Drive folder", MainViewModel.GoogleDriveProviderId).ConfigureAwait(true);
+
+    private async void OnAddNextcloud(object sender, RoutedEventArgs e)
+        => await AddCloudFolderAsync("Add Nextcloud folder", MainViewModel.NextcloudProviderId).ConfigureAwait(true);
+
+    private async Task AddCloudFolderAsync(string title, string providerId)
     {
         var picker = new Microsoft.Win32.OpenFolderDialog
         {
-            Title = "Add OneDrive folder",
+            Title = title,
             Multiselect = false
         };
         if (picker.ShowDialog(this) != true || string.IsNullOrWhiteSpace(picker.FolderName))
@@ -464,7 +545,7 @@ public partial class MainWindow : Window
             return;
         }
 
-        await Vm.AddCloudFolderAsync(picker.FolderName).ConfigureAwait(true);
+        await Vm.AddCloudFolderAsync(picker.FolderName, providerId).ConfigureAwait(true);
     }
 
     private async void OnPreviewKeyDown(object sender, KeyEventArgs e)

src/Explorer.App/SettingsWindow.xaml

@@ -0,0 +1,49 @@
+<Window x:Class="Explorer.App.SettingsWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="Settings"
+        Icon="pack://application:,,,/Assets/explorer-workbench.ico"
+        Height="620" Width="560"
+        MinHeight="520" MinWidth="480"
+        WindowStartupLocation="CenterOwner"
+        Background="{DynamicResource Bg}" Foreground="{DynamicResource Fg}"
+        ResizeMode="NoResize">
+  <DockPanel Margin="20">
+    <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,20,0,0">
+      <Button Content="OK" MinWidth="88" Height="32" IsDefault="True" Click="OnOk" Margin="0,0,8,0"/>
+      <Button Content="Cancel" MinWidth="88" Height="32" IsCancel="True" Click="OnCancel"/>
+    </StackPanel>
+    <ScrollViewer VerticalScrollBarVisibility="Auto">
+      <StackPanel>
+        <TextBlock Text="Appearance" FontSize="16" FontWeight="SemiBold" Margin="0,0,0,10"/>
+        <TextBlock Text="Theme" Foreground="{DynamicResource FgMuted}" Margin="0,0,0,8"/>
+        <StackPanel Orientation="Horizontal" Margin="0,0,0,20">
+          <RadioButton x:Name="ThemeDark" Content="Dark" GroupName="Theme" Margin="0,0,16,0"
+                       Checked="OnThemeChanged"/>
+          <RadioButton x:Name="ThemeLight" Content="Light" GroupName="Theme"
+                       Checked="OnThemeChanged"/>
+        </StackPanel>
+
+        <TextBlock Text="Locations tree" FontSize="16" FontWeight="SemiBold" Margin="0,8,0,10"/>
+        <TextBlock TextWrapping="Wrap" Foreground="{DynamicResource FgMuted}" Margin="0,0,0,12"
+                   Text="Choose whether network and cloud locations appear as their own top-level items, or are collected under a group next to This PC."/>
+
+        <CheckBox x:Name="GroupNetwork" Margin="0,0,0,6"
+                  Content="Group network drives under Network"/>
+        <TextBlock TextWrapping="Wrap" Foreground="{DynamicResource FgMuted}" Margin="24,0,0,14" FontSize="12"
+                   Text="Mapped letters and UNC shares become children of a Network item. This PC then shows only local and removable drives."/>
+
+        <CheckBox x:Name="GroupCloud" Margin="0,0,0,6"
+                  Content="Group cloud locations under Cloud"/>
+        <TextBlock TextWrapping="Wrap" Foreground="{DynamicResource FgMuted}" Margin="24,0,0,18" FontSize="12"
+                   Text="OneDrive, Google Drive, and Nextcloud become children of a Cloud item. The two options are independent."/>
+
+        <TextBlock Text="Indexing" FontSize="16" FontWeight="SemiBold" Margin="0,8,0,10"/>
+        <CheckBox x:Name="IndexArchives" Margin="0,0,0,6"
+                  Content="Include archive contents in the index"/>
+        <TextBlock TextWrapping="Wrap" Foreground="{DynamicResource FgMuted}" Margin="24,0,0,0" FontSize="12"
+                   Text="When enabled, a scan lists files inside ZIP, RAR, 7z, TAR, and similar archives from the archive catalog — files are not extracted. Individual uncompressed sizes are stored. Folder totals still use the archive’s size on disk. Online-only cloud archives are skipped."/>
+      </StackPanel>
+    </ScrollViewer>
+  </DockPanel>
+</Window>

src/Explorer.App/SettingsWindow.xaml.cs

@@ -0,0 +1,51 @@
+using System.Windows;
+using Explorer.Application;
+using Explorer.Presentation.ViewModels;
+
+namespace Explorer.App;
+
+public partial class SettingsWindow : Window
+{
+    private readonly MainViewModel _vm;
+    private readonly string _originalTheme;
+
+    public SettingsWindow(MainViewModel vm)
+    {
+        InitializeComponent();
+        _vm = vm;
+        var prefs = vm.CurrentPreferences();
+        _originalTheme = prefs.Theme;
+        ThemeDark.IsChecked = prefs.Theme != "Light";
+        ThemeLight.IsChecked = prefs.Theme == "Light";
+        GroupNetwork.IsChecked = prefs.GroupNetworkPlaces;
+        GroupCloud.IsChecked = prefs.GroupCloudPlaces;
+        IndexArchives.IsChecked = prefs.IndexArchiveContents;
+    }
+
+    private void OnThemeChanged(object sender, RoutedEventArgs e)
+    {
+        if (!IsLoaded)
+        {
+            return;
+        }
+
+        _vm.Theme = ThemeLight.IsChecked == true ? "Light" : "Dark";
+    }
+
+    private async void OnOk(object sender, RoutedEventArgs e)
+    {
+        var prefs = new UiPreferences(
+            ThemeLight.IsChecked == true ? "Light" : "Dark",
+            GroupNetwork.IsChecked == true,
+            GroupCloud.IsChecked == true,
+            IndexArchives.IsChecked == true);
+        await _vm.ApplyPreferencesAsync(prefs).ConfigureAwait(true);
+        DialogResult = true;
+        Close();
+    }
+
+    private void OnCancel(object sender, RoutedEventArgs e)
+    {
+        _vm.Theme = _originalTheme;
+    }
+}

src/Explorer.Application/BrowseService.cs

@@ -10,26 +10,68 @@ public sealed class BrowseService
     private readonly IIndexStore _store;
     private readonly SourceManager _sources;
     private readonly StorageProviderRegistry _providers;
+    private readonly CloudPlaceStore _cloudPlaces;
+    private readonly UiPreferencesStore _preferences;
 
     public BrowseService(
         IFileSystemEnumerator enumerator,
         IVolumeService volumes,
         IIndexStore store,
         SourceManager sources,
-        StorageProviderRegistry providers)
+        StorageProviderRegistry providers,
+        CloudPlaceStore cloudPlaces,
+        UiPreferencesStore preferences)
     {
         _enumerator = enumerator;
         _volumes = volumes;
         _store = store;
         _sources = sources;
         _providers = providers;
+        _cloudPlaces = cloudPlaces;
+        _preferences = preferences;
     }
 
     public async Task<FolderListing> ListThisPcAsync(CancellationToken cancellationToken = default)
+    {
+        var groupNetwork = _preferences.Load().GroupNetworkPlaces;
+        return await ListSourcesAsync(
+            LocationRoots.ThisPc,
+            source => !groupNetwork || !source.Kind.IsNetwork(),
+            cancellationToken).ConfigureAwait(false);
+    }
+
+    public Task<FolderListing> ListNetworkAsync(CancellationToken cancellationToken = default)
+        => ListSourcesAsync(LocationRoots.Network, source => source.Kind.IsNetwork(), cancellationToken);
+
+    public Task<FolderListing> ListCloudAsync(CancellationToken cancellationToken = default)
+    {
+        var items = CloudPlaceStore.Merge(_providers.GetPlaces(), _cloudPlaces.Load())
+            .OrderBy(p => p.DisplayName, StringComparer.CurrentCultureIgnoreCase)
+            .Select(place =>
+            {
+                var exists = Directory.Exists(place.Path);
+                return new FileSystemItem
+                {
+                    FullPath = place.Path,
+                    Name = exists ? place.DisplayName : $"{place.DisplayName}  (Offline)",
+                    IsDirectory = true,
+                    Attributes = AttributeFlags.Directory
+                };
+            })
+            .ToList();
+        return Task.FromResult(new FolderListing { Path = LocationRoots.Cloud, Items = items });
+    }
+
+    private async Task<FolderListing> ListSourcesAsync(
+        string path,
+        Func<Source, bool> include,
+        CancellationToken cancellationToken)
     {
         var sources = await _sources.RefreshOnlineStateAsync(cancellationToken).ConfigureAwait(false);
         var items = new List<FileSystemItem>();
-        foreach (var source in sources.OrderBy(s => s.Kind).ThenBy(s => s.DisplayName, StringComparer.CurrentCultureIgnoreCase))
+        foreach (var source in sources.Where(include)
+                     .OrderBy(s => s.Kind)
+                     .ThenBy(s => s.DisplayName, StringComparer.CurrentCultureIgnoreCase))
         {
             IndexEntry? root = null;
             if (source.IsIndexed)
@@ -49,12 +91,21 @@ public sealed class BrowseService
             });
         }
 
-        return new FolderListing { Path = "This PC", Items = items };
+        return new FolderListing { Path = path, Items = items };
     }
 
     public async Task<FolderListing> ListAsync(string path, CancellationToken cancellationToken = default)
     {
         var source = await _sources.FindByPathAsync(path, cancellationToken).ConfigureAwait(false);
+        if (source is { IsIndexed: true } && _preferences.Load().IndexArchiveContents)
+        {
+            var archiveListing = await TryListArchiveAsync(source, path, cancellationToken).ConfigureAwait(false);
+            if (archiveListing is not null)
+            {
+                return archiveListing;
+            }
+        }
+
         var reachable = _volumes.IsPathReachable(path);
 
         if (reachable)
@@ -106,6 +157,73 @@ public sealed class BrowseService
         return new FolderListing { Path = path, IsOffline = true, Error = "Path not found" };
     }
 
+    public bool CanBrowseArchive(string name)
+        => _preferences.Load().IndexArchiveContents && ArchiveFormats.IsArchive(name);
+
+    private async Task<FolderListing?> TryListArchiveAsync(Source source, string path, CancellationToken cancellationToken)
+    {
+        if (source.LastRootPath is null)
+        {
+            return null;
+        }
+
+        var rel = PathRules.MakeRelative(source.LastRootPath, path);
+        var entry = await _store.Entries.GetByPathAsync(source.Id, rel, cancellationToken).ConfigureAwait(false);
+        if (entry is null)
+        {
+            return null;
+        }
+
+        var isArchiveFile = !entry.IsDirectory && ArchiveFormats.IsArchive(entry.Name);
+        if (!isArchiveFile && Directory.Exists(path))
+        {
+            return null;
+        }
+
+        if (!isArchiveFile && !await IsUnderArchiveAsync(source.Id, rel, cancellationToken).ConfigureAwait(false))
+        {
+            return null;
+        }
+
+        var children = await _store.Entries.GetChildrenAsync(source.Id, entry.Id, EntryStatus.Present, cancellationToken)
+            .ConfigureAwait(false);
+        var items = children.Select(c => new FileSystemItem
+        {
+            FullPath = PathRules.Combine(source.LastRootPath, c.PathRel),
+            Name = c.Name,
+            IsDirectory = c.IsDirectory,
+            SizeBytes = c.IsDirectory ? c.AggregateSize : c.SizeBytes,
+            CreatedUtc = c.CreatedUtc,
+            ModifiedUtc = c.ModifiedUtc,
+            Attributes = c.Attributes,
+            FileId = c.FileId,
+            ReparseTag = c.ReparseTag,
+            AllocatedSizeBytes = c.AllocatedSizeBytes
+        }).ToList();
+
+        var hint = isArchiveFile && items.Count == 0
+            ? "Archive contents appear after the next scan."
+            : null;
+        return new FolderListing { Path = path, IsOffline = false, Items = items, Error = hint };
+    }
+
+    private async Task<bool> IsUnderArchiveAsync(long sourceId, string pathRel, CancellationToken cancellationToken)
+    {
+        var current = pathRel;
+        while (!string.IsNullOrEmpty(current))
+        {
+            var entry = await _store.Entries.GetByPathAsync(sourceId, current, cancellationToken).ConfigureAwait(false);
+            if (entry is { IsDirectory: false } && ArchiveFormats.IsArchive(entry.Name))
+            {
+                return true;
+            }
+
+            current = PathRules.RelativeParent(current);
+        }
+
+        return false;
+    }
+
     private async Task<List<FileSystemItem>> OverlayFolderSizesAsync(
         Source source,
         string path,

src/Explorer.Application/CloudPlaceStore.cs

@@ -32,7 +32,7 @@ public sealed class CloudPlaceStore
     public IReadOnlyList<ProviderPlace> Add(string providerId, string path, string? displayName = null)
     {
         var places = Load().ToList();
-        var trimmed = path.Trim().TrimEnd('\\');
+        var trimmed = CloudPath.NormalizePlace(path);
         if (string.IsNullOrWhiteSpace(trimmed))
         {
             return places;
@@ -42,7 +42,13 @@ public sealed class CloudPlaceStore
         var label = string.IsNullOrWhiteSpace(displayName) ? Path.GetFileName(trimmed) : displayName.Trim();
         if (string.IsNullOrWhiteSpace(label))
         {
-            label = "OneDrive";
+            label = providerId switch
+            {
+                "googledrive" => "Google Drive",
+                "nextcloud" => "Nextcloud",
+                "onedrive" => "OneDrive",
+                _ => "Cloud folder"
+            };
         }
 
         places.Add(new ProviderPlace(providerId, label, trimmed));
@@ -75,7 +81,7 @@ public sealed class CloudPlaceStore
                 continue;
             }
 
-            var path = place.Path.TrimEnd('\\');
+            var path = CloudPath.NormalizePlace(place.Path);
             if (list.Exists(p => p.Path.Equals(path, StringComparison.OrdinalIgnoreCase)))
             {
                 continue;
@@ -104,7 +110,7 @@ public sealed class CloudPlaceStore
                 continue;
             }
 
-            list.Add(new ProviderPlace(parts[0], Unescape(parts[1]), parts[2].TrimEnd('\\')));
+            list.Add(new ProviderPlace(parts[0], Unescape(parts[1]), CloudPath.NormalizePlace(parts[2])));
         }
 
         return list;

src/Explorer.Application/IArchiveCatalog.cs

@@ -0,0 +1,8 @@
+namespace Explorer.Application;
+
+public sealed record ArchiveMember(string RelativePath, bool IsDirectory, long SizeBytes);
+
+public interface IArchiveCatalog
+{
+    IReadOnlyList<ArchiveMember> TryList(string archivePath, CancellationToken cancellationToken = default);
+}

src/Explorer.Application/PathHistoryStore.cs

@@ -1,3 +1,4 @@
+using Explorer.Domain;
 using Explorer.Domain.Abstractions;
 
 namespace Explorer.Application;
@@ -54,7 +55,7 @@ public sealed class PathHistoryStore
         foreach (var raw in paths)
         {
             var path = raw.Trim();
-            if (string.IsNullOrWhiteSpace(path) || path == "This PC")
+            if (string.IsNullOrWhiteSpace(path) || LocationRoots.IsVirtual(path))
             {
                 continue;
             }

src/Explorer.Application/SourceManager.cs

@@ -162,6 +162,53 @@ public sealed class SourceManager
         return source;
     }
 
+    public bool IsPresentInWindows(Source source)
+    {
+        var online = _volumes.EnumerateOnlineVolumes();
+        foreach (var fp in online)
+        {
+            var match = VolumeIdentityMatcher.Match(fp, [source]);
+            if (match.Source is not null)
+            {
+                return true;
+            }
+
+            if (source.LastRootPath is not null && RootsEqual(fp.RootPath, source.LastRootPath))
+            {
+                return true;
+            }
+        }
+
+        return source.LastRootPath is not null && _volumes.IsPathReachable(source.LastRootPath);
+    }
+
+    public bool CanForget(Source source) => !IsPresentInWindows(source);
+
+    public async Task<bool> CanForgetPathAsync(string path, CancellationToken cancellationToken = default)
+    {
+        var source = await FindSourceRootAsync(path, cancellationToken).ConfigureAwait(false);
+        return source is not null && CanForget(source);
+    }
+
+    public async Task<bool> ForgetDisconnectedAsync(string path, CancellationToken cancellationToken = default)
+    {
+        var source = await FindSourceRootAsync(path, cancellationToken).ConfigureAwait(false);
+        if (source is null || !CanForget(source))
+        {
+            return false;
+        }
+
+        await _store.RunWriteAsync(store => store.Sources.DeleteAsync(source.Id, cancellationToken), cancellationToken)
+            .ConfigureAwait(false);
+        if (source.LastRootPath is not null && PathRules.IsUnc(source.LastRootPath))
+        {
+            ForgetUnc(PathRules.CanonicalUncRoot(source.LastRootPath));
+        }
+
+        _logger.LogInformation("Forgot disconnected source {DisplayName} ({Path})", source.DisplayName, source.LastRootPath);
+        return true;
+    }
+
     public async Task<Source?> FindByPathAsync(string path, CancellationToken cancellationToken = default)
     {
         var sources = await _store.Sources.GetAllAsync(cancellationToken).ConfigureAwait(false);
@@ -194,7 +241,7 @@ public sealed class SourceManager
 
     public async Task<Source?> EnsureForPathAsync(string path, CancellationToken cancellationToken = default)
     {
-        if (string.IsNullOrWhiteSpace(path) || path == "This PC")
+        if (string.IsNullOrWhiteSpace(path) || LocationRoots.IsVirtual(path))
         {
             return null;
         }
@@ -255,6 +302,50 @@ public sealed class SourceManager
         return created;
     }
 
+    private async Task<Source?> FindSourceRootAsync(string path, CancellationToken cancellationToken)
+    {
+        if (string.IsNullOrWhiteSpace(path) || LocationRoots.IsVirtual(path))
+        {
+            return null;
+        }
+
+        var source = await FindByPathAsync(path, cancellationToken).ConfigureAwait(false);
+        if (source?.LastRootPath is null)
+        {
+            return null;
+        }
+
+        return RootsEqual(source.LastRootPath, path) ? source : null;
+    }
+
+    private static bool RootsEqual(string a, string b)
+    {
+        var left = PathRules.EnsureDirectoryTrailingSlashIfRoot(PathRules.FromExtended(a).TrimEnd('\\'));
+        var right = PathRules.EnsureDirectoryTrailingSlashIfRoot(PathRules.FromExtended(b).TrimEnd('\\'));
+        return left.Equals(right, StringComparison.OrdinalIgnoreCase);
+    }
+
+    private void ForgetUnc(string root)
+    {
+        try
+        {
+            var file = Path.Combine(_env.DataDirectory, "recents.txt");
+            if (!File.Exists(file))
+            {
+                return;
+            }
+
+            var lines = LoadRecents()
+                .Where(l => !PathRules.CanonicalUncRoot(l).Equals(root, StringComparison.OrdinalIgnoreCase))
+                .ToList();
+            File.WriteAllLines(file, lines);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogDebug(ex, "Failed updating recents");
+        }
+    }
+
     private IReadOnlyList<string> LoadRecents()
     {
         var file = Path.Combine(_env.DataDirectory, "recents.txt");

src/Explorer.Application/UiPreferencesStore.cs

@@ -0,0 +1,109 @@
+using Explorer.Domain.Abstractions;
+
+namespace Explorer.Application;
+
+public sealed record UiPreferences(
+    string Theme,
+    bool GroupNetworkPlaces,
+    bool GroupCloudPlaces,
+    bool IndexArchiveContents = false)
+{
+    public static UiPreferences Default { get; } = new("Dark", false, false, false);
+}
+
+public sealed class UiPreferencesStore
+{
+    public const string FileName = "ui-preferences.txt";
+
+    private readonly IAppEnvironment _env;
+
+    public UiPreferencesStore(IAppEnvironment env) => _env = env;
+
+    public UiPreferences Load()
+    {
+        var file = Path.Combine(_env.DataDirectory, FileName);
+        try
+        {
+            if (!File.Exists(file))
+            {
+                return UiPreferences.Default;
+            }
+
+            return Parse(File.ReadAllLines(file));
+        }
+        catch
+        {
+            return UiPreferences.Default;
+        }
+    }
+
+    public void Save(UiPreferences preferences)
+    {
+        try
+        {
+            Directory.CreateDirectory(_env.DataDirectory);
+            File.WriteAllLines(Path.Combine(_env.DataDirectory, FileName),
+            [
+                "theme=" + NormalizeTheme(preferences.Theme),
+                "group-network=" + (preferences.GroupNetworkPlaces ? "true" : "false"),
+                "group-cloud=" + (preferences.GroupCloudPlaces ? "true" : "false"),
+                "index-archives=" + (preferences.IndexArchiveContents ? "true" : "false")
+            ]);
+        }
+        catch
+        {
+            // preferences are convenience-only
+        }
+    }
+
+    public static UiPreferences Parse(IEnumerable<string> lines)
+    {
+        var theme = UiPreferences.Default.Theme;
+        var groupNetwork = false;
+        var groupCloud = false;
+        var indexArchives = false;
+        foreach (var raw in lines)
+        {
+            var line = raw.Trim();
+            if (string.IsNullOrWhiteSpace(line) || line.StartsWith('#'))
+            {
+                continue;
+            }
+
+            var eq = line.IndexOf('=');
+            if (eq <= 0)
+            {
+                continue;
+            }
+
+            var key = line[..eq].Trim();
+            var value = line[(eq + 1)..].Trim();
+            if (key.Equals("theme", StringComparison.OrdinalIgnoreCase))
+            {
+                theme = NormalizeTheme(value);
+            }
+            else if (key.Equals("group-network", StringComparison.OrdinalIgnoreCase))
+            {
+                groupNetwork = IsTrue(value);
+            }
+            else if (key.Equals("group-cloud", StringComparison.OrdinalIgnoreCase))
+            {
+                groupCloud = IsTrue(value);
+            }
+            else if (key.Equals("index-archives", StringComparison.OrdinalIgnoreCase))
+            {
+                indexArchives = IsTrue(value);
+            }
+        }
+
+        return new UiPreferences(theme, groupNetwork, groupCloud, indexArchives);
+    }
+
+    public static string NormalizeTheme(string? theme)
+        => theme is not null && theme.Equals("Light", StringComparison.OrdinalIgnoreCase) ? "Light" : "Dark";
+
+    private static bool IsTrue(string value)
+        => value.Equals("true", StringComparison.OrdinalIgnoreCase)
+           || value.Equals("1", StringComparison.OrdinalIgnoreCase)
+           || value.Equals("yes", StringComparison.OrdinalIgnoreCase);
+}

src/Explorer.Domain/Abstractions/IIndexStore.cs

@@ -30,6 +30,7 @@ public interface ISourceStore
     Task UpdateUsnAsync(long id, long journalId, long nextUsn, CancellationToken cancellationToken = default);
     Task UpdateIndexedAsync(long id, DateTimeOffset utc, long generation, CancellationToken cancellationToken = default);
     Task SetLastSeenAsync(long id, string rootPath, DateTimeOffset utc, CancellationToken cancellationToken = default);
+    Task DeleteAsync(long id, CancellationToken cancellationToken = default);
 }
 
 public interface IEntryStore
@@ -48,6 +49,7 @@ public interface IEntryStore
     Task MarkSourceOfflineAsync(long sourceId, CancellationToken cancellationToken = default);
     Task MarkSourceOnlinePresentAsync(long sourceId, CancellationToken cancellationToken = default);
     Task TombstoneAsync(long id, DateTimeOffset utc, CancellationToken cancellationToken = default);
+    Task TombstoneByPathPrefixAsync(long sourceId, string pathRelPrefix, DateTimeOffset utc, CancellationToken cancellationToken = default);
     Task DeleteExpiredTombstonesAsync(DateTimeOffset cutoffUtc, CancellationToken cancellationToken = default);
     Task RenameSubtreePathAsync(long sourceId, string oldPathRel, string newPathRel, CancellationToken cancellationToken = default);
     Task<long> CountPresentAsync(long sourceId, CancellationToken cancellationToken = default);

src/Explorer.Domain/AppConstants.cs

@@ -18,4 +18,5 @@ public static class AppConstants
     public const int LocalScanParallelism = 4;
     public const int NetworkScanParallelism = 1;
     public const int ProgressHzMilliseconds = 100;
+    public const int MaxArchiveEntries = 8000;
 }

src/Explorer.Domain/ArchiveFormats.cs

@@ -0,0 +1,71 @@
+namespace Explorer.Domain;
+
+public static class ArchiveFormats
+{
+    private static readonly HashSet<string> Extensions = new(StringComparer.OrdinalIgnoreCase)
+    {
+        "zip", "zipx", "cbz", "epub",
+        "rar", "cbr",
+        "7z", "cb7",
+        "tar", "tgz", "tbz", "tbz2", "txz",
+        "gz", "bz2", "xz",
+        "cab"
+    };
+
+    private static readonly HashSet<string> ZipFamily = new(StringComparer.OrdinalIgnoreCase)
+    {
+        "zip", "zipx", "cbz", "epub"
+    };
+
+    public static bool IsArchive(string name)
+    {
+        var ext = NameNormalizer.Extension(name);
+        if (ext is not null && Extensions.Contains(ext))
+        {
+            return true;
+        }
+
+        var lower = name.ToLowerInvariant();
+        return lower.EndsWith(".tar.gz", StringComparison.Ordinal)
+               || lower.EndsWith(".tar.bz2", StringComparison.Ordinal)
+               || lower.EndsWith(".tar.xz", StringComparison.Ordinal);
+    }
+
+    public static bool IsZipFamily(string name)
+    {
+        var ext = NameNormalizer.Extension(name);
+        return ext is not null && ZipFamily.Contains(ext);
+    }
+
+    public static bool TryNormalizeEntryPath(string raw, out string relative)
+    {
+        relative = string.Empty;
+        if (string.IsNullOrWhiteSpace(raw))
+        {
+            return false;
+        }
+
+        var n = raw.Replace('/', '\\').Trim().TrimStart('\\');
+        if (string.IsNullOrEmpty(n))
+        {
+            return false;
+        }
+
+        if (n.Contains(':', StringComparison.Ordinal) || Path.IsPathRooted(n))
+        {
+            return false;
+        }
+
+        var parts = n.Split('\\', StringSplitOptions.RemoveEmptyEntries);
+        foreach (var part in parts)
+        {
+            if (part is "." or "..")
+            {
+                return false;
+            }
+        }
+
+        relative = string.Join('\\', parts);
+        return relative.Length > 0;
+    }
+}

src/Explorer.Domain/Enums.cs

@@ -9,6 +9,11 @@ public enum SourceKind
     Cloud
 }
 
+public static class SourceKinds
+{
+    public static bool IsNetwork(this SourceKind kind) => kind is SourceKind.Smb or SourceKind.Nfs;
+}
+
 public enum SourceStatus
 {
     Online,

src/Explorer.Domain/LocationRoots.cs

@@ -0,0 +1,11 @@
+namespace Explorer.Domain;
+
+public static class LocationRoots
+{
+    public const string ThisPc = "This PC";
+    public const string Network = "Network";
+    public const string Cloud = "Cloud";
+
+    public static bool IsVirtual(string? path)
+        => path is ThisPc or Network or Cloud;
+}

src/Explorer.Domain/PathRules.cs

@@ -150,6 +150,18 @@ public static class PathRules
         return idx < 0 ? p : p[(idx + 1)..];
     }
 
+    public static string RelativeParent(string pathRel)
+    {
+        if (string.IsNullOrEmpty(pathRel))
+        {
+            return string.Empty;
+        }
+
+        var n = NormalizeDirectorySeparators(pathRel).TrimEnd('\\');
+        var idx = n.LastIndexOf('\\');
+        return idx < 0 ? string.Empty : n[..idx];
+    }
+
     public static string JoinDisplay(string? root, string pathRel)
     {
         if (string.IsNullOrWhiteSpace(root))

src/Explorer.Indexing/ArchiveCatalog.cs

@@ -0,0 +1,96 @@
+using System.IO.Compression;
+using Explorer.Application;
+using Explorer.Domain;
+using SharpCompress.Archives;
+using SharpCompress.Readers;
+
+namespace Explorer.Indexing;
+
+public sealed class ArchiveCatalog : IArchiveCatalog
+{
+    public IReadOnlyList<ArchiveMember> TryList(string archivePath, CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            if (!File.Exists(archivePath))
+            {
+                return [];
+            }
+
+            var name = Path.GetFileName(archivePath);
+            if (ArchiveFormats.IsZipFamily(name))
+            {
+                return ListZip(archivePath, cancellationToken);
+            }
+
+            return ListGeneric(archivePath, cancellationToken);
+        }
+        catch
+        {
+            return [];
+        }
+    }
+
+    private static IReadOnlyList<ArchiveMember> ListZip(string archivePath, CancellationToken cancellationToken)
+    {
+        using var stream = new FileStream(archivePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+        using var zip = new ZipArchive(stream, ZipArchiveMode.Read, leaveOpen: false);
+        return Collect(zip.Entries.Select(e => (
+            e.FullName,
+            e.FullName.EndsWith('/') || e.FullName.EndsWith('\\'),
+            e.Length)), cancellationToken);
+    }
+
+    private static IReadOnlyList<ArchiveMember> ListGeneric(string archivePath, CancellationToken cancellationToken)
+    {
+        try
+        {
+            using var archive = ArchiveFactory.OpenArchive(archivePath);
+            return Collect(archive.Entries.Select(e => (
+                e.Key ?? "",
+                e.IsDirectory,
+                e.Size)), cancellationToken);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch
+        {
+            using var reader = ReaderFactory.OpenReader(archivePath);
+            var raw = new List<(string Path, bool IsDirectory, long Size)>();
+            while (reader.MoveToNextEntry())
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                raw.Add((reader.Entry.Key ?? "", reader.Entry.IsDirectory, reader.Entry.Size));
+            }
+
+            return Collect(raw, cancellationToken);
+        }
+    }
+
+    private static IReadOnlyList<ArchiveMember> Collect(
+        IEnumerable<(string Path, bool IsDirectory, long Size)> entries,
+        CancellationToken cancellationToken)
+    {
+        var seen = new Dictionary<string, ArchiveMember>(StringComparer.OrdinalIgnoreCase);
+        foreach (var (path, isDirectory, size) in entries)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            if (seen.Count >= AppConstants.MaxArchiveEntries)
+            {
+                break;
+            }
+
+            if (!ArchiveFormats.TryNormalizeEntryPath(path, out var relative))
+            {
+                continue;
+            }
+
+            var dir = isDirectory || path.EndsWith('/') || path.EndsWith('\\');
+            seen[relative] = new ArchiveMember(relative, dir, dir ? 0 : Math.Max(0, size));
+        }
+
+        return seen.Values.ToList();
+    }
+}

src/Explorer.Indexing/ArchiveContentsIndexer.cs

@@ -0,0 +1,111 @@
+using Explorer.Application;
+using Explorer.Domain;
+using Explorer.Domain.Abstractions;
+using Microsoft.Extensions.Logging;
+
+namespace Explorer.Indexing;
+
+public sealed class ArchiveContentsIndexer
+{
+    private readonly IIndexStore _store;
+    private readonly IFileSystemEnumerator _enumerator;
+    private readonly IHydrationGuard _hydration;
+    private readonly IArchiveCatalog _catalog;
+    private readonly UiPreferencesStore _preferences;
+    private readonly ILogger<ArchiveContentsIndexer> _logger;
+
+    public ArchiveContentsIndexer(
+        IIndexStore store,
+        IFileSystemEnumerator enumerator,
+        IHydrationGuard hydration,
+        IArchiveCatalog catalog,
+        UiPreferencesStore preferences,
+        ILogger<ArchiveContentsIndexer> logger)
+    {
+        _store = store;
+        _enumerator = enumerator;
+        _hydration = hydration;
+        _catalog = catalog;
+        _preferences = preferences;
+        _logger = logger;
+    }
+
+    public bool IsEnabled => _preferences.Load().IndexArchiveContents;
+
+    public Task TombstoneInnerAsync(long sourceId, string archivePathRel, DateTimeOffset utc, CancellationToken cancellationToken)
+        => _store.Entries.TombstoneByPathPrefixAsync(sourceId, archivePathRel, utc, cancellationToken);
+
+    public async Task ExpandIfNeededAsync(
+        Source source,
+        IndexEntry archive,
+        DateTimeOffset now,
+        long generation,
+        CancellationToken cancellationToken)
+    {
+        if (!IsEnabled
+            || archive.IsDirectory
+            || archive.Id <= 0
+            || string.IsNullOrEmpty(source.LastRootPath)
+            || !ArchiveFormats.IsArchive(archive.Name))
+        {
+            return;
+        }
+
+        var full = PathRules.Combine(source.LastRootPath, archive.PathRel);
+        var item = _enumerator.GetItem(full);
+        if (item is null)
+        {
+            return;
+        }
+
+        if (_hydration.WouldHydrateOnRead(item)
+            || await _hydration.WouldHydrateOnReadAsync(full, cancellationToken).ConfigureAwait(false))
+        {
+            return;
+        }
+
+        IReadOnlyList<ArchiveMember> members;
+        try
+        {
+            members = _catalog.TryList(full, cancellationToken);
+        }
+        catch (OperationCanceledException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _logger.LogDebug(ex, "Archive listing failed for {Path}", full);
+            return;
+        }
+
+        var nodes = ArchiveTreeBuilder.Build(archive, members);
+        await _store.RunWriteAsync(async s =>
+        {
+            await s.Entries.TombstoneByPathPrefixAsync(source.Id, archive.PathRel, now, cancellationToken)
+                .ConfigureAwait(false);
+            var ids = new Dictionary<string, long>(StringComparer.OrdinalIgnoreCase)
+            {
+                [archive.PathRel] = archive.Id
+            };
+
+            foreach (var node in nodes)
+            {
+                if (!ids.TryGetValue(node.ParentPathRel, out var parentId))
+                {
+                    continue;
+                }
+
+                var entry = node.ToEntry(source, parentId, now, generation);
+                entry.Id = await s.Entries.UpsertAsync(entry, cancellationToken).ConfigureAwait(false);
+                ids[node.PathRel] = entry.Id;
+                if (node.IsDirectory)
+                {
+                    await s.Entries.UpdateAggregatesAsync(
+                        entry.Id, node.AggregateSize, node.ChildFiles, node.ChildDirs, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+            }
+        }, cancellationToken).ConfigureAwait(false);
+    }
+}

src/Explorer.Indexing/ArchiveTreeBuilder.cs

@@ -0,0 +1,139 @@
+using Explorer.Application;
+using Explorer.Domain;
+
+namespace Explorer.Indexing;
+
+internal sealed record ArchiveNode(
+    string PathRel,
+    string ParentPathRel,
+    string Name,
+    bool IsDirectory,
+    long SizeBytes,
+    long AggregateSize,
+    int ChildFiles,
+    int ChildDirs);
+
+internal static class ArchiveTreeBuilder
+{
+    public static IReadOnlyList<ArchiveNode> Build(
+        IndexEntry archive,
+        IReadOnlyList<ArchiveMember> members)
+    {
+        var dirs = new Dictionary<string, DirAcc>(StringComparer.OrdinalIgnoreCase);
+        var files = new List<(string PathRel, string Name, long Size)>();
+
+        foreach (var member in members)
+        {
+            var parts = member.RelativePath.Split('\\', StringSplitOptions.RemoveEmptyEntries);
+            if (parts.Length == 0)
+            {
+                continue;
+            }
+
+            var dirCount = member.IsDirectory ? parts.Length : parts.Length - 1;
+            var prefix = "";
+            for (var i = 0; i < dirCount; i++)
+            {
+                prefix = prefix.Length == 0 ? parts[i] : prefix + "\\" + parts[i];
+                dirs.TryAdd(prefix, new DirAcc(parts[i]));
+            }
+
+            if (!member.IsDirectory)
+            {
+                files.Add((member.RelativePath, parts[^1], member.SizeBytes));
+            }
+        }
+
+        foreach (var file in files)
+        {
+            var parent = PathRules.RelativeParent(file.PathRel);
+            while (parent.Length > 0)
+            {
+                if (dirs.TryGetValue(parent, out var acc))
+                {
+                    acc.Size += file.Size;
+                    acc.Files++;
+                }
+
+                parent = PathRules.RelativeParent(parent);
+            }
+        }
+
+        foreach (var dirRel in dirs.Keys)
+        {
+            var parent = PathRules.RelativeParent(dirRel);
+            while (parent.Length > 0)
+            {
+                if (dirs.TryGetValue(parent, out var acc))
+                {
+                    acc.Dirs++;
+                }
+
+                parent = PathRules.RelativeParent(parent);
+            }
+        }
+
+        var nodes = new List<ArchiveNode>(dirs.Count + files.Count);
+        foreach (var (rel, acc) in dirs)
+        {
+            nodes.Add(ToNode(archive.PathRel, rel, acc.Name, true, 0, acc.Size, acc.Files, acc.Dirs));
+        }
+
+        foreach (var file in files)
+        {
+            nodes.Add(ToNode(archive.PathRel, file.PathRel, file.Name, false, file.Size, file.Size, 0, 0));
+        }
+
+        return nodes
+            .OrderBy(n => n.PathRel.Count(c => c == '\\'))
+            .ThenBy(n => n.PathRel, StringComparer.OrdinalIgnoreCase)
+            .ToList();
+    }
+
+    public static IndexEntry ToEntry(this ArchiveNode node, Source source, long parentId, DateTimeOffset now, long generation)
+        => new()
+        {
+            SourceId = source.Id,
+            ParentId = parentId,
+            Name = node.Name,
+            NameNorm = NameNormalizer.Normalize(node.Name),
+            Extension = node.IsDirectory ? null : NameNormalizer.Extension(node.Name),
+            IsDirectory = node.IsDirectory,
+            SizeBytes = node.IsDirectory ? 0 : node.SizeBytes,
+            AggregateSize = node.AggregateSize,
+            ChildFileCount = node.ChildFiles,
+            ChildDirCount = node.ChildDirs,
+            LastSeenUtc = now,
+            LastIndexedUtc = now,
+            Status = EntryStatus.Present,
+            PathRel = node.PathRel,
+            ScanGeneration = generation,
+            HashState = HashState.Skipped
+        };
+
+    private static ArchiveNode ToNode(
+        string archivePathRel,
+        string innerRel,
+        string name,
+        bool isDir,
+        long size,
+        long aggregate,
+        int files,
+        int dirs)
+    {
+        var pathRel = string.IsNullOrEmpty(archivePathRel) ? innerRel : archivePathRel + "\\" + innerRel;
+        var parentInner = PathRules.RelativeParent(innerRel);
+        var parentPathRel = parentInner.Length == 0
+            ? archivePathRel
+            : (string.IsNullOrEmpty(archivePathRel) ? parentInner : archivePathRel + "\\" + parentInner);
+        return new ArchiveNode(pathRel, parentPathRel, name, isDir, size, aggregate, files, dirs);
+    }
+
+    private sealed class DirAcc(string name)
+    {
+        public string Name { get; } = name;
+        public long Size { get; set; }
+        public int Files { get; set; }
+        public int Dirs { get; set; }
+    }
+}

src/Explorer.Indexing/Explorer.Indexing.csproj

@@ -5,6 +5,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.0" />
+    <PackageReference Include="SharpCompress" Version="0.50.4" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Explorer.Application\Explorer.Application.csproj" />

src/Explorer.Indexing/FilesystemScanner.cs

@@ -11,17 +11,20 @@ public sealed class FilesystemScanner
     private readonly IFileSystemEnumerator _enumerator;
     private readonly StorageProviderRegistry _providers;
     private readonly ILogger<FilesystemScanner> _logger;
+    private readonly ArchiveContentsIndexer? _archives;
 
     public FilesystemScanner(
         IIndexStore store,
         IFileSystemEnumerator enumerator,
         StorageProviderRegistry providers,
-        ILogger<FilesystemScanner> logger)
+        ILogger<FilesystemScanner> logger,
+        ArchiveContentsIndexer? archives = null)
     {
         _store = store;
         _enumerator = enumerator;
         _providers = providers;
         _logger = logger;
+        _archives = archives;
     }
 
     public async Task<ScanJob> ScanAsync(
@@ -155,7 +158,8 @@ public sealed class FilesystemScanner
                         }
                     }
 
-                    await FlushAsync(pending, childDirs, cancellationToken).ConfigureAwait(false);
+                    await FlushAsync(pending, childDirs, source, now, generation, expandArchives: true, cancellationToken)
+                        .ConfigureAwait(false);
                     frame.Expanded = true;
                     for (var i = childDirs.Count - 1; i >= 0; i--)
                     {
@@ -184,7 +188,8 @@ public sealed class FilesystemScanner
                 }
             }
 
-            await FlushAsync(pending, [], cancellationToken).ConfigureAwait(false);
+            await FlushAsync(pending, [], source, now, generation, expandArchives: true, cancellationToken)
+                .ConfigureAwait(false);
             await _store.Entries.MarkMissingAsDeletedAsync(source.Id, generation, DateTimeOffset.UtcNow, string.IsNullOrEmpty(startRel) ? null : startRel, cancellationToken)
                 .ConfigureAwait(false);
             await _store.Sources.UpdateIndexedAsync(source.Id, DateTimeOffset.UtcNow, generation, cancellationToken)
@@ -198,7 +203,8 @@ public sealed class FilesystemScanner
         }
         catch (OperationCanceledException)
         {
-            await FlushAsync(pending, [], CancellationToken.None).ConfigureAwait(false);
+            await FlushAsync(pending, [], source, now, generation, expandArchives: true, CancellationToken.None)
+                .ConfigureAwait(false);
             job.Status = ScanJobStatus.Cancelled;
             job.FinishedUtc = DateTimeOffset.UtcNow;
             await _store.ScanJobs.UpdateAsync(job, CancellationToken.None).ConfigureAwait(false);
@@ -219,7 +225,14 @@ public sealed class FilesystemScanner
         }
     }
 
-    private async Task FlushAsync(List<IndexEntry> pending, List<Frame> dirs, CancellationToken cancellationToken)
+    private async Task FlushAsync(
+        List<IndexEntry> pending,
+        List<Frame> dirs,
+        Source source,
+        DateTimeOffset now,
+        long generation,
+        bool expandArchives,
+        CancellationToken cancellationToken)
     {
         if (pending.Count == 0)
         {
@@ -244,7 +257,24 @@ public sealed class FilesystemScanner
             }
         }
 
+        var flushed = pending.ToList();
         pending.Clear();
+
+        if (!expandArchives || _archives is null)
+        {
+            return;
+        }
+
+        foreach (var entry in flushed)
+        {
+            if (entry.IsDirectory || !ArchiveFormats.IsArchive(entry.Name))
+            {
+                continue;
+            }
+
+            await _archives.ExpandIfNeededAsync(source, entry, now, generation, cancellationToken)
+                .ConfigureAwait(false);
+        }
     }
 
     private static ScanProgress ToProgress(ScanJob job, string path) => new()

src/Explorer.Indexing/FolderReconciler.cs

@@ -1,7 +1,6 @@
 using Explorer.Application;
 using Explorer.Domain;
 using Explorer.Domain.Abstractions;
-using Microsoft.Extensions.Logging;
 
 namespace Explorer.Indexing;
 
@@ -10,12 +9,18 @@ public sealed class FolderReconciler
     private readonly IIndexStore _store;
     private readonly IFileSystemEnumerator _enumerator;
     private readonly StorageProviderRegistry _providers;
+    private readonly ArchiveContentsIndexer? _archives;
 
-    public FolderReconciler(IIndexStore store, IFileSystemEnumerator enumerator, StorageProviderRegistry providers)
+    public FolderReconciler(
+        IIndexStore store,
+        IFileSystemEnumerator enumerator,
+        StorageProviderRegistry providers,
+        ArchiveContentsIndexer? archives = null)
     {
         _store = store;
         _enumerator = enumerator;
         _providers = providers;
+        _archives = archives;
     }
 
     public async Task ReconcileAsync(Source source, string pathRel, CancellationToken cancellationToken)
@@ -32,12 +37,38 @@ public sealed class FolderReconciler
             return;
         }
 
+        if (!parent.IsDirectory)
+        {
+            if (ArchiveFormats.IsArchive(parent.Name))
+            {
+                if (_archives is { IsEnabled: true } && File.Exists(full))
+                {
+                    await _archives.ExpandIfNeededAsync(source, parent, DateTimeOffset.UtcNow, source.ScanGeneration, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+                else
+                {
+                    await _store.Entries.TombstoneByPathPrefixAsync(source.Id, parent.PathRel, DateTimeOffset.UtcNow, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+            }
+
+            return;
+        }
+
+        if (!Directory.Exists(full))
+        {
+            return;
+        }
+
         var live = await _providers.EnrichAsync(_enumerator.EnumerateChildrenSafe(full, out _), cancellationToken)
             .ConfigureAwait(false);
         var indexed = await _store.Entries.GetChildrenAsync(source.Id, parent.Id, EntryStatus.Present, cancellationToken)
             .ConfigureAwait(false);
         var now = DateTimeOffset.UtcNow;
         var liveNames = new HashSet<string>(live.Select(i => NameNormalizer.Normalize(i.Name)), StringComparer.Ordinal);
+        var archivesToExpand = new List<IndexEntry>();
+        var archivesToTomb = new List<string>();
 
         await _store.RunWriteAsync(async s =>
         {
@@ -71,6 +102,7 @@ public sealed class FolderReconciler
                 var existing = indexed.FirstOrDefault(e => e.NameNorm == entry.NameNorm);
                 var oldSize = existing is { IsDirectory: false } ? existing.SizeBytes : 0;
                 var id = await s.Entries.UpsertAsync(entry, cancellationToken).ConfigureAwait(false);
+                entry.Id = id;
                 if (!item.IsDirectory)
                 {
                     var delta = item.SizeBytes - oldSize;
@@ -84,14 +116,17 @@ public sealed class FolderReconciler
                         await s.Entries.ApplySizeDeltaToAncestorsAsync(parent.Id, delta, 0, 0, cancellationToken)
                             .ConfigureAwait(false);
                     }
+
+                    if (ArchiveFormats.IsArchive(item.Name))
+                    {
+                        archivesToExpand.Add(entry);
+                    }
                 }
                 else if (existing is null)
                 {
                     await s.Entries.ApplySizeDeltaToAncestorsAsync(parent.Id, 0, 0, 1, cancellationToken)
                         .ConfigureAwait(false);
                 }
-
-                _ = id;
             }
 
             foreach (var old in indexed)
@@ -99,8 +134,27 @@ public sealed class FolderReconciler
                 if (!liveNames.Contains(old.NameNorm))
                 {
                     await s.Entries.TombstoneAsync(old.Id, now, cancellationToken).ConfigureAwait(false);
+                    if (!old.IsDirectory && ArchiveFormats.IsArchive(old.Name))
+                    {
+                        archivesToTomb.Add(old.PathRel);
+                    }
                 }
             }
         }, cancellationToken).ConfigureAwait(false);
+
+        foreach (var path in archivesToTomb)
+        {
+            await _store.Entries.TombstoneByPathPrefixAsync(source.Id, path, now, cancellationToken)
+                .ConfigureAwait(false);
+        }
+
+        if (_archives is { IsEnabled: true })
+        {
+            foreach (var archive in archivesToExpand)
+            {
+                await _archives.ExpandIfNeededAsync(source, archive, now, source.ScanGeneration, cancellationToken)
+                    .ConfigureAwait(false);
+            }
+        }
     }
 }

src/Explorer.Indexing/UsnChangeApplier.cs

@@ -9,12 +9,18 @@ public sealed class UsnChangeApplier
     private readonly IIndexStore _store;
     private readonly IFileSystemEnumerator _enumerator;
     private readonly ILogger<UsnChangeApplier> _logger;
+    private readonly ArchiveContentsIndexer? _archives;
 
-    public UsnChangeApplier(IIndexStore store, IFileSystemEnumerator enumerator, ILogger<UsnChangeApplier> logger)
+    public UsnChangeApplier(
+        IIndexStore store,
+        IFileSystemEnumerator enumerator,
+        ILogger<UsnChangeApplier> logger,
+        ArchiveContentsIndexer? archives = null)
     {
         _store = store;
         _enumerator = enumerator;
         _logger = logger;
+        _archives = archives;
     }
 
     public async Task<UsnReadStatus> ApplyAsync(Source source, IUsnJournal journal, CancellationToken cancellationToken)
@@ -64,6 +70,7 @@ public sealed class UsnChangeApplier
 
         var coalesced = Coalesce(records);
         var now = DateTimeOffset.UtcNow;
+        var expand = new List<IndexEntry>();
         await _store.RunWriteAsync(async s =>
         {
             foreach (var rec in coalesced)
@@ -71,7 +78,11 @@ public sealed class UsnChangeApplier
                 cancellationToken.ThrowIfCancellationRequested();
                 try
                 {
-                    await ApplyRecord(s, source, rec, now, cancellationToken).ConfigureAwait(false);
+                    var updated = await ApplyRecord(s, source, rec, now, cancellationToken).ConfigureAwait(false);
+                    if (updated is not null)
+                    {
+                        expand.Add(updated);
+                    }
                 }
                 catch (Exception ex)
                 {
@@ -82,10 +93,19 @@ public sealed class UsnChangeApplier
             await s.Sources.UpdateUsnAsync(source.Id, next.JournalId, next.NextUsn, cancellationToken).ConfigureAwait(false);
         }, cancellationToken).ConfigureAwait(false);
 
+        if (_archives is { IsEnabled: true })
+        {
+            foreach (var archive in expand)
+            {
+                await _archives.ExpandIfNeededAsync(source, archive, now, source.ScanGeneration, cancellationToken)
+                    .ConfigureAwait(false);
+            }
+        }
+
         return UsnReadStatus.Ok;
     }
 
-    private async Task ApplyRecord(IIndexStore store, Source source, UsnRecord rec, DateTimeOffset now, CancellationToken cancellationToken)
+    private async Task<IndexEntry?> ApplyRecord(IIndexStore store, Source source, UsnRecord rec, DateTimeOffset now, CancellationToken cancellationToken)
     {
         var existing = rec.FileReferenceNumber != 0
             ? await store.Entries.GetByFileIdAsync(source.Id, rec.FileReferenceNumber, cancellationToken).ConfigureAwait(false)
@@ -96,9 +116,14 @@ public sealed class UsnChangeApplier
             if (existing is not null)
             {
                 await store.Entries.TombstoneAsync(existing.Id, now, cancellationToken).ConfigureAwait(false);
+                if (!existing.IsDirectory && ArchiveFormats.IsArchive(existing.Name))
+                {
+                    await store.Entries.TombstoneByPathPrefixAsync(source.Id, existing.PathRel, now, cancellationToken)
+                        .ConfigureAwait(false);
+                }
             }
 
-            return;
+            return null;
         }
 
         var parent = rec.ParentFileReferenceNumber != 0
@@ -115,9 +140,14 @@ public sealed class UsnChangeApplier
             if (existing is not null)
             {
                 await store.Entries.TombstoneAsync(existing.Id, now, cancellationToken).ConfigureAwait(false);
+                if (!existing.IsDirectory && ArchiveFormats.IsArchive(existing.Name))
+                {
+                    await store.Entries.TombstoneByPathPrefixAsync(source.Id, existing.PathRel, now, cancellationToken)
+                        .ConfigureAwait(false);
+                }
             }
 
-            return;
+            return null;
         }
 
         var oldSize = existing is { IsDirectory: false } ? existing.SizeBytes : 0;
@@ -150,7 +180,7 @@ public sealed class UsnChangeApplier
                 .ConfigureAwait(false);
         }
 
-        await store.Entries.UpsertAsync(entry, cancellationToken).ConfigureAwait(false);
+        entry.Id = await store.Entries.UpsertAsync(entry, cancellationToken).ConfigureAwait(false);
         if (!live.IsDirectory)
         {
             var delta = live.SizeBytes - oldSize;
@@ -164,9 +194,16 @@ public sealed class UsnChangeApplier
                 await store.Entries.ApplySizeDeltaToAncestorsAsync(parent?.Id, delta, 0, 0, cancellationToken)
                     .ConfigureAwait(false);
             }
+
+            if (ArchiveFormats.IsArchive(live.Name))
+            {
+                return entry;
             }
         }
 
+        return null;
+    }
+
     private static List<UsnRecord> Coalesce(IReadOnlyList<UsnRecord> records)
     {
         var map = new Dictionary<long, UsnRecord>();

src/Explorer.Plugin.Abstractions/ProviderContracts.cs

@@ -80,7 +80,38 @@ public sealed record ProviderQuota(
 public sealed record ProviderPlace(
     string ProviderId,
     string DisplayName,
-    string Path);
+    string Path,
+    string? Glyph = null);
+
+public static class CloudPath
+{
+    public static string NormalizePlace(string path)
+    {
+        var n = path.Replace('/', '\\').Trim();
+        if (n.Length >= 2 && n[1] == ':')
+        {
+            if (n.Length == 2 || (n.Length == 3 && n[2] == '\\'))
+            {
+                return char.ToUpperInvariant(n[0]) + @":\";
+            }
+        }
+
+        return n.TrimEnd('\\');
+    }
+
+    public static bool IsUnder(string root, string path)
+    {
+        if (string.IsNullOrWhiteSpace(root) || string.IsNullOrWhiteSpace(path))
+        {
+            return false;
+        }
+
+        var a = NormalizePlace(root).TrimEnd('\\');
+        var b = NormalizePlace(path).TrimEnd('\\');
+        return b.Equals(a, StringComparison.OrdinalIgnoreCase)
+               || b.StartsWith(a + "\\", StringComparison.OrdinalIgnoreCase);
+    }
+}
 
 public interface IStorageProvider
 {

src/Explorer.Plugin.GoogleDrive/DriveFsPreferenceReader.cs

@@ -0,0 +1,143 @@
+using Microsoft.Data.Sqlite;
+using Explorer.Plugin.Abstractions;
+
+namespace Explorer.Plugin.GoogleDrive;
+
+public sealed record DriveFsMediaRow(string Name, string LastMountPoint, int FileSystemType);
+
+public sealed record DriveFsRootRow(string Title, string RootPath, string LastSeenAbsolutePath, bool IsMyDrive);
+
+public static class DriveFsPreferenceReader
+{
+    public const string DatabaseFileName = "root_preference_sqlite.db";
+
+    public static string DefaultDatabasePath
+        => Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+            "Google",
+            "DriveFS",
+            DatabaseFileName);
+
+    public static IReadOnlyList<ProviderPlace> ReadPlaces(string? databasePath = null)
+    {
+        var db = string.IsNullOrWhiteSpace(databasePath) ? DefaultDatabasePath : databasePath;
+        try
+        {
+            if (!File.Exists(db))
+            {
+                return [];
+            }
+
+            return PlacesFromTables(ReadMedia(db), ReadRoots(db));
+        }
+        catch
+        {
+            return [];
+        }
+    }
+
+    public static IReadOnlyList<ProviderPlace> PlacesFromTables(
+        IEnumerable<DriveFsMediaRow> media,
+        IEnumerable<DriveFsRootRow>? roots = null)
+    {
+        var found = new List<ProviderPlace>();
+
+        foreach (var row in media)
+        {
+            if (!IsGoogleDriveVolume(row))
+            {
+                continue;
+            }
+
+            var path = CloudPath.NormalizePlace(row.LastMountPoint);
+            if (path.Length == 0 || found.Exists(p => CloudPath.IsUnder(p.Path, path) || CloudPath.IsUnder(path, p.Path)))
+            {
+                continue;
+            }
+
+            found.Add(new ProviderPlace(GoogleDriveStorageProvider.ProviderId, "Google Drive", path, GoogleDrivePlaceDiscovery.Glyph));
+        }
+
+        foreach (var row in roots ?? [])
+        {
+            var path = FirstNonEmpty(row.LastSeenAbsolutePath, row.RootPath);
+            if (string.IsNullOrWhiteSpace(path))
+            {
+                continue;
+            }
+
+            var normalized = CloudPath.NormalizePlace(path);
+            if (normalized.Length == 0
+                || found.Exists(p => CloudPath.IsUnder(p.Path, normalized)))
+            {
+                continue;
+            }
+
+            var title = string.IsNullOrWhiteSpace(row.Title) ? null : row.Title.Trim();
+            var label = string.IsNullOrWhiteSpace(title) || title.Equals("My Drive", StringComparison.OrdinalIgnoreCase)
+                ? "Google Drive"
+                : $"Google Drive - {title}";
+            found.Add(new ProviderPlace(GoogleDriveStorageProvider.ProviderId, label, normalized, GoogleDrivePlaceDiscovery.Glyph));
+        }
+
+        return found;
+    }
+
+    public static bool IsGoogleDriveVolume(DriveFsMediaRow row)
+        => row.Name.Equals("Google Drive", StringComparison.OrdinalIgnoreCase)
+           || row.Name.Contains("Google Drive", StringComparison.OrdinalIgnoreCase);
+
+    private static IReadOnlyList<DriveFsMediaRow> ReadMedia(string databasePath)
+    {
+        using var connection = OpenReadOnly(databasePath);
+        using var cmd = connection.CreateCommand();
+        cmd.CommandText = "SELECT name, last_mount_point, fs_type FROM media;";
+        using var reader = cmd.ExecuteReader();
+        var rows = new List<DriveFsMediaRow>();
+        while (reader.Read())
+        {
+            rows.Add(new DriveFsMediaRow(
+                reader.IsDBNull(0) ? "" : reader.GetString(0),
+                reader.IsDBNull(1) ? "" : reader.GetString(1),
+                reader.IsDBNull(2) ? 0 : reader.GetInt32(2)));
+        }
+
+        return rows;
+    }
+
+    private static IReadOnlyList<DriveFsRootRow> ReadRoots(string databasePath)
+    {
+        using var connection = OpenReadOnly(databasePath);
+        using var cmd = connection.CreateCommand();
+        cmd.CommandText = "SELECT title, root_path, last_seen_absolute_path, is_my_drive FROM roots;";
+        using var reader = cmd.ExecuteReader();
+        var rows = new List<DriveFsRootRow>();
+        while (reader.Read())
+        {
+            rows.Add(new DriveFsRootRow(
+                reader.IsDBNull(0) ? "" : reader.GetString(0),
+                reader.IsDBNull(1) ? "" : reader.GetString(1),
+                reader.IsDBNull(2) ? "" : reader.GetString(2),
+                !reader.IsDBNull(3) && reader.GetBoolean(3)));
+        }
+
+        return rows;
+    }
+
+    private static SqliteConnection OpenReadOnly(string databasePath)
+    {
+        var builder = new SqliteConnectionStringBuilder
+        {
+            DataSource = databasePath,
+            Mode = SqliteOpenMode.ReadOnly,
+            Cache = SqliteCacheMode.Shared,
+            Pooling = false
+        };
+        var connection = new SqliteConnection(builder.ConnectionString);
+        connection.Open();
+        return connection;
+    }
+
+    private static string? FirstNonEmpty(params string?[] values)
+        => values.FirstOrDefault(v => !string.IsNullOrWhiteSpace(v));
+}

src/Explorer.Plugin.GoogleDrive/Explorer.Plugin.GoogleDrive.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <RootNamespace>Explorer.Plugin.GoogleDrive</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="10.0.2" />
+    <PackageReference Include="SQLitePCLRaw.lib.e_sqlite3" Version="2.1.12" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Explorer.Plugin.Abstractions\Explorer.Plugin.Abstractions.csproj" />
+    <ProjectReference Include="..\Explorer.Windows\Explorer.Windows.csproj" />
+  </ItemGroup>
+</Project>

src/Explorer.Plugin.GoogleDrive/GoogleDrivePlaceDiscovery.cs

@@ -0,0 +1,118 @@
+using Explorer.Plugin.Abstractions;
+using Explorer.Windows;
+
+namespace Explorer.Plugin.GoogleDrive;
+
+public static class GoogleDrivePlaceDiscovery
+{
+    public const string Glyph = "\uE753";
+
+    public static IReadOnlyList<ProviderPlace> Discover()
+    {
+        var found = new List<ProviderPlace>();
+        void Add(string providerPath, string label)
+        {
+            if (string.IsNullOrWhiteSpace(providerPath))
+            {
+                return;
+            }
+
+            var trimmed = CloudPath.NormalizePlace(providerPath);
+            if (trimmed.Length == 0
+                || found.Exists(p => p.Path.Equals(trimmed, StringComparison.OrdinalIgnoreCase)))
+            {
+                return;
+            }
+
+            found.Add(new ProviderPlace(GoogleDriveStorageProvider.ProviderId, label, trimmed, Glyph));
+        }
+
+        foreach (var place in DriveFsPreferenceReader.ReadPlaces())
+        {
+            Add(place.Path, place.DisplayName);
+        }
+
+        foreach (var root in WindowsSyncRootDiscovery.Matching("GoogleDrive", "DriveFS", "Google Drive", "Google.Drive"))
+        {
+            Add(root.Path, BuildLabel(root.Path, root.DisplayName));
+        }
+
+        foreach (var drive in DriveInfo.GetDrives().Where(d => d.IsReady))
+        {
+            try
+            {
+                var letter = CloudPath.NormalizePlace(drive.RootDirectory.FullName);
+                if (found.Exists(p => CloudPath.IsUnder(p.Path, letter) || CloudPath.IsUnder(letter, p.Path)))
+                {
+                    continue;
+                }
+
+                if (drive.VolumeLabel.Equals("Google Drive", StringComparison.OrdinalIgnoreCase))
+                {
+                    Add(letter, "Google Drive");
+                    continue;
+                }
+
+                var myDrive = Path.Combine(drive.RootDirectory.FullName, "My Drive");
+                var shared = Path.Combine(drive.RootDirectory.FullName, "Shared drives");
+                if (Directory.Exists(myDrive))
+                {
+                    Add(myDrive, "Google Drive");
+                }
+
+                if (Directory.Exists(shared))
+                {
+                    Add(shared, "Shared drives");
+                }
+            }
+            catch
+            {
+                // skip inaccessible volumes
+            }
+        }
+
+        var profile = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+        AddIfExists(Path.Combine(profile, "Google Drive"), "Google Drive");
+        AddIfExists(Path.Combine(profile, "My Drive"), "Google Drive");
+        return found;
+
+        void AddIfExists(string providerPath, string label)
+        {
+            try
+            {
+                if (Directory.Exists(providerPath))
+                {
+                    Add(providerPath, label);
+                }
+            }
+            catch
+            {
+                // guessed roots are optional
+            }
+        }
+    }
+
+    public static string BuildLabel(string path, string? displayName)
+    {
+        var folder = Path.GetFileName(path.TrimEnd('\\'));
+        if (folder.Equals("My Drive", StringComparison.OrdinalIgnoreCase)
+            || folder.Equals("Google Drive", StringComparison.OrdinalIgnoreCase))
+        {
+            return "Google Drive";
+        }
+
+        if (folder.Equals("Shared drives", StringComparison.OrdinalIgnoreCase)
+            || folder.Equals("Shared Drives", StringComparison.OrdinalIgnoreCase))
+        {
+            return "Shared drives";
+        }
+
+        if (!string.IsNullOrWhiteSpace(displayName)
+            && displayName.Contains("Google", StringComparison.OrdinalIgnoreCase))
+        {
+            return displayName;
+        }
+
+        return string.IsNullOrWhiteSpace(folder) ? "Google Drive" : $"Google Drive - {folder}";
+    }
+}

src/Explorer.Plugin.GoogleDrive/GoogleDrivePlaceholderState.cs

@@ -0,0 +1,101 @@
+using Explorer.Plugin.Abstractions;
+using Explorer.Windows;
+
+namespace Explorer.Plugin.GoogleDrive;
+
+public static class GoogleDrivePlaceholderState
+{
+    public const int Offline = 0x1000;
+    public const int RecallOnOpen = 0x40000;
+    public const int Pinned = 0x80000;
+    public const int Unpinned = 0x100000;
+    public const int RecallOnDataAccess = 0x400000;
+
+    public static ProviderItemState FromLocalSignals(
+        string providerId,
+        string path,
+        int attributes,
+        int reparseTag,
+        long logicalSize,
+        long? allocatedSize,
+        uint? placeholderState)
+    {
+        var availability = MapAvailability(attributes, placeholderState);
+        var hydrateOnRead = availability == CloudAvailability.OnlineOnly
+            || (attributes & (RecallOnDataAccess | Offline)) != 0
+            || (placeholderState is uint cf && (cf & CloudFilesNative.PlaceholderPartial) != 0
+                && (attributes & RecallOnDataAccess) != 0);
+        var hydrateOnOpen = hydrateOnRead || (attributes & RecallOnOpen) != 0;
+
+        return new ProviderItemState(
+            providerId,
+            path,
+            availability,
+            logicalSize,
+            allocatedSize,
+            hydrateOnOpen,
+            hydrateOnRead,
+            StatusText(availability),
+            availability == CloudAvailability.Error ? "Cloud placeholder reported an error" : null);
+    }
+
+    public static CloudAvailability MapAvailability(int attributes, uint? placeholderState)
+    {
+        if (placeholderState == CloudFilesNative.PlaceholderInvalid)
+        {
+            return CloudAvailability.Error;
+        }
+
+        if ((attributes & Pinned) != 0 && (attributes & Unpinned) == 0)
+        {
+            return CloudAvailability.Pinned;
+        }
+
+        if ((attributes & RecallOnDataAccess) != 0 || (attributes & Offline) != 0)
+        {
+            return CloudAvailability.OnlineOnly;
+        }
+
+        if (placeholderState is uint cf)
+        {
+            if ((cf & CloudFilesNative.PlaceholderPartial) != 0
+                && (cf & CloudFilesNative.PlaceholderInSync) == 0)
+            {
+                return CloudAvailability.Syncing;
+            }
+
+            if ((cf & CloudFilesNative.Placeholder) != 0
+                && (cf & CloudFilesNative.PlaceholderPartial) != 0)
+            {
+                return CloudAvailability.OnlineOnly;
+            }
+        }
+
+        if ((attributes & Unpinned) != 0 && (attributes & RecallOnDataAccess) == 0)
+        {
+            return CloudAvailability.LocallyAvailable;
+        }
+
+        if (placeholderState is uint known && (known & CloudFilesNative.Placeholder) != 0)
+        {
+            return CloudAvailability.LocallyAvailable;
+        }
+
+        if ((attributes & (Pinned | Unpinned | RecallOnDataAccess | Offline | RecallOnOpen)) != 0)
+        {
+            return CloudAvailability.LocallyAvailable;
+        }
+
+        return CloudAvailability.Unknown;
+    }
+
+    public static string StatusText(CloudAvailability availability) => availability switch
+    {
+        CloudAvailability.OnlineOnly => "Online-only",
+        CloudAvailability.LocallyAvailable => "Available on this device",
+        CloudAvailability.Pinned => "Always available on this device",
+        CloudAvailability.Syncing => "Syncing",
+        CloudAvailability.Error => "Sync error",
+        _ => ""
+    };
+}

src/Explorer.Plugin.GoogleDrive/GoogleDriveStorageProvider.cs

@@ -0,0 +1,148 @@
+using Explorer.Plugin.Abstractions;
+using Explorer.Windows;
+
+namespace Explorer.Plugin.GoogleDrive;
+
+public sealed class GoogleDriveStorageProvider : IStorageProvider
+{
+    public const string ProviderId = "googledrive";
+
+    private readonly object _gate = new();
+    private IReadOnlyList<ProviderPlace>? _places;
+
+    public ProviderManifest Manifest { get; } = new(
+        ProviderId,
+        "Google Drive",
+        "1.0.0",
+        ProviderIsolation.InProcess);
+
+    public ProviderCapability GetCapabilities()
+    {
+        var caps = ProviderCapability.CloudState;
+        if (GetPlaces().Any(p => CloudFilesNative.IsCloudSyncRoot(p.Path)))
+        {
+            caps |= ProviderCapability.Pin | ProviderCapability.Dehydrate;
+        }
+
+        return caps;
+    }
+
+    public bool TryMatchRoot(string path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return false;
+        }
+
+        foreach (var root in GetPlaces())
+        {
+            if (CloudPath.IsUnder(root.Path, path))
+            {
+                return true;
+            }
+        }
+
+        return LooksLikeGoogleDrive(path) && CloudFilesNative.IsCloudSyncRoot(path);
+    }
+
+    public Task<IReadOnlyList<ProviderItemState>> GetItemStatesAsync(
+        IReadOnlyList<string> paths,
+        CancellationToken cancellationToken = default)
+    {
+        var results = new List<ProviderItemState>(paths.Count);
+        foreach (var path in paths)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            if (!TryMatchRoot(path))
+            {
+                continue;
+            }
+
+            try
+            {
+                var attrs = (int)File.GetAttributes(path);
+                var isDir = (attrs & (int)FileAttributes.Directory) != 0;
+                long logical = 0;
+                if (!isDir)
+                {
+                    try { logical = new FileInfo(path).Length; } catch { /* locked */ }
+                }
+
+                var allocated = CloudFilesNative.TryGetAllocatedSize(path);
+                var placeholder = CloudFilesNative.TryGetPlaceholderState(attrs, 0);
+                results.Add(GoogleDrivePlaceholderState.FromLocalSignals(
+                    ProviderId, path, attrs, 0, logical, allocated, placeholder));
+            }
+            catch
+            {
+                // fail-open for this item
+            }
+        }
+
+        return Task.FromResult<IReadOnlyList<ProviderItemState>>(results);
+    }
+
+    public Task<ProviderActionResult> TryInvokeAsync(ProviderActionRequest request, CancellationToken cancellationToken = default)
+    {
+        var capabilities = GetCapabilities();
+        var needed = request.Action switch
+        {
+            ProviderAction.Pin or ProviderAction.Unpin => ProviderCapability.Pin,
+            ProviderAction.Dehydrate => ProviderCapability.Dehydrate,
+            _ => ProviderCapability.None
+        };
+
+        if (needed == ProviderCapability.None || (capabilities & needed) == 0)
+        {
+            return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Unsupported, "This action is not available."));
+        }
+
+        var pin = request.Action switch
+        {
+            ProviderAction.Pin => CloudFilesNative.PinPinned,
+            ProviderAction.Unpin or ProviderAction.Dehydrate => CloudFilesNative.PinUnpinned,
+            _ => CloudFilesNative.PinUnspecified
+        };
+
+        var failed = 0;
+        foreach (var path in request.Paths)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            if (!CloudFilesNative.TrySetPinState(path, pin))
+            {
+                failed++;
+            }
+        }
+
+        if (failed == 0)
+        {
+            return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Succeeded));
+        }
+
+        if (failed == request.Paths.Count)
+        {
+            return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Failed, "Google Drive could not change the pin state."));
+        }
+
+        return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Failed, $"Google Drive could not change the pin state for {failed} item(s)."));
+    }
+
+    public Task<ProviderQuota?> TryGetQuotaAsync(string rootPath, CancellationToken cancellationToken = default)
+        => Task.FromResult<ProviderQuota?>(null);
+
+    public IReadOnlyList<ProviderPlace> GetPlaces()
+    {
+        lock (_gate)
+        {
+            return _places ??= GoogleDrivePlaceDiscovery.Discover();
+        }
+    }
+
+    public static bool LooksLikeGoogleDrive(string path)
+    {
+        var n = path.Replace('/', '\\');
+        return n.Contains(@"\Google Drive", StringComparison.OrdinalIgnoreCase)
+               || n.Contains(@"\My Drive", StringComparison.OrdinalIgnoreCase)
+               || n.Contains(@"\Shared drives", StringComparison.OrdinalIgnoreCase);
+    }
+}

src/Explorer.Plugin.Nextcloud/Explorer.Plugin.Nextcloud.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <RootNamespace>Explorer.Plugin.Nextcloud</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Explorer.Plugin.Abstractions\Explorer.Plugin.Abstractions.csproj" />
+    <ProjectReference Include="..\Explorer.Windows\Explorer.Windows.csproj" />
+  </ItemGroup>
+</Project>

src/Explorer.Plugin.Nextcloud/NextcloudPlaceDiscovery.cs

@@ -0,0 +1,198 @@
+using Explorer.Plugin.Abstractions;
+using Explorer.Windows;
+
+namespace Explorer.Plugin.Nextcloud;
+
+public static class NextcloudPlaceDiscovery
+{
+    public const string Glyph = "\uE753";
+
+    public static IReadOnlyList<ProviderPlace> Discover()
+    {
+        var found = new List<ProviderPlace>();
+        void Add(string providerPath, string label)
+        {
+            if (string.IsNullOrWhiteSpace(providerPath))
+            {
+                return;
+            }
+
+            var trimmed = NormalizePath(providerPath);
+            if (trimmed.Length == 0
+                || found.Exists(p => p.Path.Equals(trimmed, StringComparison.OrdinalIgnoreCase)))
+            {
+                return;
+            }
+
+            found.Add(new ProviderPlace(NextcloudStorageProvider.ProviderId, label, trimmed, Glyph));
+        }
+
+        foreach (var file in ConfigFiles())
+        {
+            try
+            {
+                if (!File.Exists(file))
+                {
+                    continue;
+                }
+
+                foreach (var place in ParseCfg(File.ReadAllText(file)))
+                {
+                    Add(place.Path, place.DisplayName);
+                }
+            }
+            catch
+            {
+                // config is optional
+            }
+        }
+
+        foreach (var root in WindowsSyncRootDiscovery.Matching("Nextcloud", "ownCloud"))
+        {
+            Add(root.Path, BuildLabel(root.Path, null, root.DisplayName));
+        }
+
+        var profile = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+        AddIfExists(Path.Combine(profile, "Nextcloud"), "Nextcloud");
+        AddIfExists(Path.Combine(profile, "ownCloud"), "ownCloud");
+        return found;
+
+        void AddIfExists(string providerPath, string label)
+        {
+            try
+            {
+                if (Directory.Exists(providerPath))
+                {
+                    Add(providerPath, label);
+                }
+            }
+            catch
+            {
+                // guessed roots are optional
+            }
+        }
+    }
+
+    public static IReadOnlyList<ProviderPlace> ParseCfg(string text)
+    {
+        var values = ParseIni(text);
+        var places = new List<ProviderPlace>();
+        var accounts = values.Keys
+            .Select(ParseAccountFolder)
+            .Where(t => t is not null)
+            .Select(t => t!.Value)
+            .Distinct()
+            .ToList();
+
+        foreach (var (account, folder) in accounts)
+        {
+            var prefix = $"{account}\\Folders\\{folder}\\";
+            if (!values.TryGetValue(prefix + "localPath", out var local) || string.IsNullOrWhiteSpace(local))
+            {
+                continue;
+            }
+
+            values.TryGetValue($"{account}\\displayName", out var user);
+            values.TryGetValue(prefix + "targetPath", out var target);
+            var path = NormalizePath(local);
+            places.Add(new ProviderPlace(
+                NextcloudStorageProvider.ProviderId,
+                BuildLabel(path, target, user),
+                path,
+                Glyph));
+        }
+
+        return places;
+    }
+
+    public static string BuildLabel(string localPath, string? targetPath, string? displayName)
+    {
+        var targetName = LastSegment(targetPath);
+        if (!string.IsNullOrWhiteSpace(targetName)
+            && !targetName.Equals("/", StringComparison.Ordinal))
+        {
+            return $"Nextcloud - {targetName}";
+        }
+
+        var folder = Path.GetFileName(localPath.TrimEnd('\\'));
+        if (!string.IsNullOrWhiteSpace(folder)
+            && !folder.Equals("Nextcloud", StringComparison.OrdinalIgnoreCase)
+            && !folder.Equals("ownCloud", StringComparison.OrdinalIgnoreCase))
+        {
+            return $"Nextcloud - {folder}";
+        }
+
+        if (!string.IsNullOrWhiteSpace(displayName))
+        {
+            return $"Nextcloud - {displayName}";
+        }
+
+        return "Nextcloud";
+    }
+
+    private static IEnumerable<string> ConfigFiles()
+    {
+        var roaming = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+        var local = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        yield return Path.Combine(roaming, "Nextcloud", "nextcloud.cfg");
+        yield return Path.Combine(local, "Nextcloud", "nextcloud.cfg");
+        yield return Path.Combine(roaming, "ownCloud", "owncloud.cfg");
+        yield return Path.Combine(local, "ownCloud", "owncloud.cfg");
+    }
+
+    private static Dictionary<string, string> ParseIni(string text)
+    {
+        var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        foreach (var raw in text.Split(['\r', '\n'], StringSplitOptions.RemoveEmptyEntries))
+        {
+            var line = raw.Trim();
+            if (line.Length == 0 || line.StartsWith('[') || line.StartsWith('#') || line.StartsWith(';'))
+            {
+                continue;
+            }
+
+            var eq = line.IndexOf('=');
+            if (eq <= 0)
+            {
+                continue;
+            }
+
+            values[line[..eq].Trim()] = line[(eq + 1)..].Trim();
+        }
+
+        return values;
+    }
+
+    private static (string Account, string Folder)? ParseAccountFolder(string key)
+    {
+        // 0\Folders\1\localPath
+        var parts = key.Split('\\');
+        if (parts.Length >= 4
+            && parts[1].Equals("Folders", StringComparison.OrdinalIgnoreCase))
+        {
+            return (parts[0], parts[2]);
+        }
+
+        return null;
+    }
+
+    private static string NormalizePath(string path)
+        => path.Replace('/', '\\').Trim().TrimEnd('\\');
+
+    private static string? LastSegment(string? path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return null;
+        }
+
+        var n = path.Replace('\\', '/').Trim().Trim('/');
+        if (n.Length == 0)
+        {
+            return null;
+        }
+
+        var idx = n.LastIndexOf('/');
+        return idx < 0 ? n : n[(idx + 1)..];
+    }
+}

src/Explorer.Plugin.Nextcloud/NextcloudPlaceholderState.cs

@@ -0,0 +1,101 @@
+using Explorer.Plugin.Abstractions;
+using Explorer.Windows;
+
+namespace Explorer.Plugin.Nextcloud;
+
+public static class NextcloudPlaceholderState
+{
+    public const int Offline = 0x1000;
+    public const int RecallOnOpen = 0x40000;
+    public const int Pinned = 0x80000;
+    public const int Unpinned = 0x100000;
+    public const int RecallOnDataAccess = 0x400000;
+
+    public static ProviderItemState FromLocalSignals(
+        string providerId,
+        string path,
+        int attributes,
+        int reparseTag,
+        long logicalSize,
+        long? allocatedSize,
+        uint? placeholderState)
+    {
+        var availability = MapAvailability(attributes, placeholderState);
+        var hydrateOnRead = availability == CloudAvailability.OnlineOnly
+            || (attributes & (RecallOnDataAccess | Offline)) != 0
+            || (placeholderState is uint cf && (cf & CloudFilesNative.PlaceholderPartial) != 0
+                && (attributes & RecallOnDataAccess) != 0);
+        var hydrateOnOpen = hydrateOnRead || (attributes & RecallOnOpen) != 0;
+
+        return new ProviderItemState(
+            providerId,
+            path,
+            availability,
+            logicalSize,
+            allocatedSize,
+            hydrateOnOpen,
+            hydrateOnRead,
+            StatusText(availability),
+            availability == CloudAvailability.Error ? "Cloud placeholder reported an error" : null);
+    }
+
+    public static CloudAvailability MapAvailability(int attributes, uint? placeholderState)
+    {
+        if (placeholderState == CloudFilesNative.PlaceholderInvalid)
+        {
+            return CloudAvailability.Error;
+        }
+
+        if ((attributes & Pinned) != 0 && (attributes & Unpinned) == 0)
+        {
+            return CloudAvailability.Pinned;
+        }
+
+        if ((attributes & RecallOnDataAccess) != 0 || (attributes & Offline) != 0)
+        {
+            return CloudAvailability.OnlineOnly;
+        }
+
+        if (placeholderState is uint cf)
+        {
+            if ((cf & CloudFilesNative.PlaceholderPartial) != 0
+                && (cf & CloudFilesNative.PlaceholderInSync) == 0)
+            {
+                return CloudAvailability.Syncing;
+            }
+
+            if ((cf & CloudFilesNative.Placeholder) != 0
+                && (cf & CloudFilesNative.PlaceholderPartial) != 0)
+            {
+                return CloudAvailability.OnlineOnly;
+            }
+        }
+
+        if ((attributes & Unpinned) != 0 && (attributes & RecallOnDataAccess) == 0)
+        {
+            return CloudAvailability.LocallyAvailable;
+        }
+
+        if (placeholderState is uint known && (known & CloudFilesNative.Placeholder) != 0)
+        {
+            return CloudAvailability.LocallyAvailable;
+        }
+
+        if ((attributes & (Pinned | Unpinned | RecallOnDataAccess | Offline | RecallOnOpen)) != 0)
+        {
+            return CloudAvailability.LocallyAvailable;
+        }
+
+        return CloudAvailability.Unknown;
+    }
+
+    public static string StatusText(CloudAvailability availability) => availability switch
+    {
+        CloudAvailability.OnlineOnly => "Online-only",
+        CloudAvailability.LocallyAvailable => "Available on this device",
+        CloudAvailability.Pinned => "Always available on this device",
+        CloudAvailability.Syncing => "Syncing",
+        CloudAvailability.Error => "Sync error",
+        _ => ""
+    };
+}

src/Explorer.Plugin.Nextcloud/NextcloudStorageProvider.cs

@@ -0,0 +1,140 @@
+using Explorer.Plugin.Abstractions;
+using Explorer.Windows;
+
+namespace Explorer.Plugin.Nextcloud;
+
+public sealed class NextcloudStorageProvider : IStorageProvider
+{
+    public const string ProviderId = "nextcloud";
+
+    private readonly object _gate = new();
+    private IReadOnlyList<ProviderPlace>? _places;
+
+    public ProviderManifest Manifest { get; } = new(
+        ProviderId,
+        "Nextcloud",
+        "1.0.0",
+        ProviderIsolation.InProcess);
+
+    public ProviderCapability GetCapabilities()
+    {
+        var caps = ProviderCapability.CloudState;
+        if (GetPlaces().Any(p => CloudFilesNative.IsCloudSyncRoot(p.Path)))
+        {
+            caps |= ProviderCapability.Pin | ProviderCapability.Dehydrate;
+        }
+
+        return caps;
+    }
+
+    public bool TryMatchRoot(string path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return false;
+        }
+
+        foreach (var root in GetPlaces())
+        {
+            if (CloudPath.IsUnder(root.Path, path))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public Task<IReadOnlyList<ProviderItemState>> GetItemStatesAsync(
+        IReadOnlyList<string> paths,
+        CancellationToken cancellationToken = default)
+    {
+        var results = new List<ProviderItemState>(paths.Count);
+        foreach (var path in paths)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            if (!TryMatchRoot(path))
+            {
+                continue;
+            }
+
+            try
+            {
+                var attrs = (int)File.GetAttributes(path);
+                var isDir = (attrs & (int)FileAttributes.Directory) != 0;
+                long logical = 0;
+                if (!isDir)
+                {
+                    try { logical = new FileInfo(path).Length; } catch { /* locked */ }
+                }
+
+                var allocated = CloudFilesNative.TryGetAllocatedSize(path);
+                var placeholder = CloudFilesNative.TryGetPlaceholderState(attrs, 0);
+                results.Add(NextcloudPlaceholderState.FromLocalSignals(
+                    ProviderId, path, attrs, 0, logical, allocated, placeholder));
+            }
+            catch
+            {
+                // fail-open for this item
+            }
+        }
+
+        return Task.FromResult<IReadOnlyList<ProviderItemState>>(results);
+    }
+
+    public Task<ProviderActionResult> TryInvokeAsync(ProviderActionRequest request, CancellationToken cancellationToken = default)
+    {
+        var capabilities = GetCapabilities();
+        var needed = request.Action switch
+        {
+            ProviderAction.Pin or ProviderAction.Unpin => ProviderCapability.Pin,
+            ProviderAction.Dehydrate => ProviderCapability.Dehydrate,
+            _ => ProviderCapability.None
+        };
+
+        if (needed == ProviderCapability.None || (capabilities & needed) == 0)
+        {
+            return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Unsupported, "This action is not available."));
+        }
+
+        var pin = request.Action switch
+        {
+            ProviderAction.Pin => CloudFilesNative.PinPinned,
+            ProviderAction.Unpin or ProviderAction.Dehydrate => CloudFilesNative.PinUnpinned,
+            _ => CloudFilesNative.PinUnspecified
+        };
+
+        var failed = 0;
+        foreach (var path in request.Paths)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            if (!CloudFilesNative.TrySetPinState(path, pin))
+            {
+                failed++;
+            }
+        }
+
+        if (failed == 0)
+        {
+            return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Succeeded));
+        }
+
+        if (failed == request.Paths.Count)
+        {
+            return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Failed, "Nextcloud could not change the pin state."));
+        }
+
+        return Task.FromResult(new ProviderActionResult(ProviderActionStatus.Failed, $"Nextcloud could not change the pin state for {failed} item(s)."));
+    }
+
+    public Task<ProviderQuota?> TryGetQuotaAsync(string rootPath, CancellationToken cancellationToken = default)
+        => Task.FromResult<ProviderQuota?>(null);
+
+    public IReadOnlyList<ProviderPlace> GetPlaces()
+    {
+        lock (_gate)
+        {
+            return _places ??= NextcloudPlaceDiscovery.Discover();
+        }
+    }
+}

src/Explorer.Plugin.OneDrive/OneDrivePlaceDiscovery.cs

@@ -1,5 +1,6 @@
 using Microsoft.Win32;
 using Explorer.Plugin.Abstractions;
+using Explorer.Windows;
 
 namespace Explorer.Plugin.OneDrive;
 
@@ -22,7 +23,7 @@ public static class OneDrivePlaceDiscovery
                 return;
             }
 
-            found.Add(new ProviderPlace(OneDriveStorageProvider.ProviderId, label, trimmed));
+            found.Add(new ProviderPlace(OneDriveStorageProvider.ProviderId, label, trimmed, "\uE753"));
         }
 
         try
@@ -57,6 +58,12 @@ public static class OneDrivePlaceDiscovery
             // registry is optional
         }
 
+        foreach (var root in WindowsSyncRootDiscovery.Matching("OneDrive"))
+        {
+            var display = root.DisplayName is { } d && !d.StartsWith('@') ? d : null;
+            Add(root.Path, BuildLabel("", root.Path, display, null));
+        }
+
         Add(Environment.GetEnvironmentVariable("OneDriveConsumer") ?? "", "OneDrive");
         Add(Environment.GetEnvironmentVariable("OneDrive") ?? "", "OneDrive");
         Add(Environment.GetEnvironmentVariable("OneDriveCommercial") ?? "", "OneDrive - Work");

src/Explorer.Plugin.OneDrive/OneDriveStorageProvider.cs

@@ -28,13 +28,13 @@ public sealed class OneDriveStorageProvider : IStorageProvider
 
         foreach (var root in GetPlaces())
         {
-            if (IsUnder(root.Path, path))
+            if (CloudPath.IsUnder(root.Path, path))
             {
                 return true;
             }
         }
 
-        return CloudFilesNative.IsCloudSyncRoot(path);
+        return LooksLikeOneDrive(path) && CloudFilesNative.IsCloudSyncRoot(path);
     }
 
     public Task<IReadOnlyList<ProviderItemState>> GetItemStatesAsync(
@@ -130,11 +130,10 @@ public sealed class OneDriveStorageProvider : IStorageProvider
         }
     }
 
-    private static bool IsUnder(string root, string path)
+    public static bool LooksLikeOneDrive(string path)
     {
-        var a = root.TrimEnd('\\');
+        var n = path.Replace('/', '\\');
-        var b = path.TrimEnd('\\');
+        return n.Contains(@"\OneDrive", StringComparison.OrdinalIgnoreCase)
-        return b.Equals(a, StringComparison.OrdinalIgnoreCase)
+               || n.Contains("OneDrive - ", StringComparison.OrdinalIgnoreCase);
-               || b.StartsWith(a + "\\", StringComparison.OrdinalIgnoreCase);
     }
 }

src/Explorer.Presentation/ViewModels/ExplorerPaneViewModel.cs

@@ -48,7 +48,7 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
     public IReadOnlyList<BreadcrumbSegment> Breadcrumb => BuildBreadcrumb(CurrentPath);
     public bool CanGoBack => _history.CanGoBack;
     public bool CanGoForward => _history.CanGoForward;
-    public bool CanGoUp => CurrentPath is not "This PC";
+    public bool CanGoUp => !LocationRoots.IsVirtual(CurrentPath) || CurrentPath is LocationRoots.Network or LocationRoots.Cloud;
 
     public async Task NavigateAsync(string path, bool addHistory = true)
     {
@@ -69,9 +69,9 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
             OnPropertyChanged(nameof(CanGoUp));
             OnPropertyChanged(nameof(Breadcrumb));
 
-            if (path == "This PC")
+            if (LocationRoots.IsVirtual(path))
             {
-                await LoadThisPcAsync(ct).ConfigureAwait(true);
+                await LoadVirtualRootAsync(path, ct).ConfigureAwait(true);
                 return;
             }
 
@@ -108,7 +108,8 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
                 Items.Add(new FolderItemViewModel(item, sizeFromIndex && item.IsDirectory));
             }
 
-            if (CurrentSource is { IsIndexed: true, Status: SourceStatus.Online } src)
+            if (CurrentSource is { IsIndexed: true, Status: SourceStatus.Online } src
+                && Directory.Exists(path))
             {
                 var rel = PathRules.MakeRelative(src.LastRootPath ?? path, path);
                 _indexing.EnqueueReconcile(src.Id, rel);
@@ -124,13 +125,18 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
         }
     }
 
-    private async Task LoadThisPcAsync(CancellationToken cancellationToken)
+    private async Task LoadVirtualRootAsync(string path, CancellationToken cancellationToken)
     {
         IsOffline = false;
         ShowIndexBanner = false;
         CurrentSource = null;
         Items.Clear();
-        var listing = await _browse.ListThisPcAsync(cancellationToken).ConfigureAwait(true);
+        var listing = path switch
+        {
+            LocationRoots.Network => await _browse.ListNetworkAsync(cancellationToken).ConfigureAwait(true),
+            LocationRoots.Cloud => await _browse.ListCloudAsync(cancellationToken).ConfigureAwait(true),
+            _ => await _browse.ListThisPcAsync(cancellationToken).ConfigureAwait(true)
+        };
         foreach (var item in listing.Items)
         {
             Items.Add(new FolderItemViewModel(item, sizeFromIndex: item.SizeBytes > 0));
@@ -158,12 +164,13 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
     [RelayCommand]
     public Task UpAsync()
     {
-        if (CurrentPath == "This PC")
+        if (CurrentPath == LocationRoots.ThisPc)
         {
             return Task.CompletedTask;
         }
 
-        if (PathRules.IsDriveRoot(CurrentPath)
+        if (LocationRoots.IsVirtual(CurrentPath)
+            || PathRules.IsDriveRoot(CurrentPath)
             || (PathRules.IsUnc(CurrentPath)
                 && CurrentPath.Equals(PathRules.CanonicalUncRoot(CurrentPath), StringComparison.OrdinalIgnoreCase)))
         {
@@ -178,7 +185,7 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
 
     public Task OpenItemAsync(FolderItemViewModel item)
     {
-        if (item.IsDirectory)
+        if (item.IsDirectory || _browse.CanBrowseArchive(item.Item.Name))
         {
             return NavigateAsync(item.FullPath);
         }
@@ -202,7 +209,7 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
 
     public void RescanFolder()
     {
-        if (CurrentSource is null || CurrentPath == "This PC")
+        if (CurrentSource is null || LocationRoots.IsVirtual(CurrentPath))
         {
             return;
         }
@@ -216,12 +223,21 @@ public sealed partial class ExplorerPaneViewModel : ObservableObject
 
     private static IReadOnlyList<BreadcrumbSegment> BuildBreadcrumb(string path)
     {
-        if (path == "This PC")
+        if (path == LocationRoots.ThisPc)
         {
-            return [new BreadcrumbSegment("This PC", "This PC", IsLast: true)];
+            return [new BreadcrumbSegment(LocationRoots.ThisPc, LocationRoots.ThisPc, IsLast: true)];
         }
 
-        var parts = new List<BreadcrumbSegment> { new("This PC", "This PC") };
+        if (path is LocationRoots.Network or LocationRoots.Cloud)
+        {
+            return
+            [
+                new BreadcrumbSegment(LocationRoots.ThisPc, LocationRoots.ThisPc),
+                new BreadcrumbSegment(path, path, IsLast: true)
+            ];
+        }
+
+        var parts = new List<BreadcrumbSegment> { new(LocationRoots.ThisPc, LocationRoots.ThisPc) };
         var p = PathRules.FromExtended(path);
         if (PathRules.IsUnc(p))
         {

src/Explorer.Presentation/ViewModels/ExplorerTabViewModel.cs

@@ -1,5 +1,6 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using Explorer.Application;
+using Explorer.Domain;
 using Explorer.FileOperations;
 using Explorer.Indexing;
 
@@ -33,7 +34,9 @@ public sealed partial class ExplorerTabViewModel : ObservableObject
         {
             if (e.PropertyName == nameof(ExplorerPaneViewModel.CurrentPath))
             {
-                Title = Left.CurrentPath == "This PC" ? "This PC" : Path.GetFileName(Left.CurrentPath.TrimEnd('\\'));
+                Title = LocationRoots.IsVirtual(Left.CurrentPath)
+                    ? Left.CurrentPath
+                    : Path.GetFileName(Left.CurrentPath.TrimEnd('\\'));
                 if (string.IsNullOrEmpty(Title))
                 {
                     Title = Left.CurrentPath;

src/Explorer.Presentation/ViewModels/MainViewModel.cs

@@ -21,6 +21,7 @@ public sealed partial class MainViewModel : ObservableObject
     private readonly PathHistoryStore _pathHistory;
     private readonly StorageProviderRegistry _providers;
     private readonly CloudPlaceStore _cloudPlaces;
+    private readonly UiPreferencesStore _preferences;
     private List<string> _clipboard = [];
     private bool _clipboardIsCut;
 
@@ -31,6 +32,7 @@ public sealed partial class MainViewModel : ObservableObject
     [ObservableProperty] private string? _promptUnc;
     [ObservableProperty] private bool _showCloudPin;
     [ObservableProperty] private bool _showCloudDehydrate;
+    [ObservableProperty] private bool _showForgetSource;
 
     private readonly IOsClipboard Clipboard;
     private readonly SynchronizationContext? _ui = SynchronizationContext.Current;
@@ -47,7 +49,8 @@ public sealed partial class MainViewModel : ObservableObject
         IOsClipboard clipboard,
         PathHistoryStore pathHistory,
         StorageProviderRegistry providers,
-        CloudPlaceStore cloudPlaces)
+        CloudPlaceStore cloudPlaces,
+        UiPreferencesStore preferences)
     {
         _browse = browse;
         _ops = ops;
@@ -56,8 +59,11 @@ public sealed partial class MainViewModel : ObservableObject
         _pathHistory = pathHistory;
         _providers = providers;
         _cloudPlaces = cloudPlaces;
+        _preferences = preferences;
+        var prefs = preferences.Load();
+        Theme = prefs.Theme;
         PathHistory = [];
-        Tree = new NavigationTreeViewModel(sources, browse, providers, cloudPlaces);
+        Tree = new NavigationTreeViewModel(sources, browse, providers, cloudPlaces, preferences);
         Search = new SearchViewModel(search, sources);
         Analysis = new AnalysisViewModel(analysis);
         Duplicates = new DuplicateViewModel(store, sources);
@@ -252,7 +258,7 @@ public sealed partial class MainViewModel : ObservableObject
             _clipboardIsCut = cut;
         }
 
-        if (_clipboard.Count == 0 || ActivePane.CurrentPath == "This PC" || ActivePane.IsOffline)
+        if (_clipboard.Count == 0 || LocationRoots.IsVirtual(ActivePane.CurrentPath) || ActivePane.IsOffline)
         {
             return;
         }
@@ -279,7 +285,7 @@ public sealed partial class MainViewModel : ObservableObject
     public void CopyPath()
     {
         var paths = SelectedPaths();
-        if (paths.Count == 0 && ActivePane.CurrentPath != "This PC")
+        if (paths.Count == 0 && !LocationRoots.IsVirtual(ActivePane.CurrentPath))
         {
             paths = [ActivePane.CurrentPath];
         }
@@ -290,7 +296,7 @@ public sealed partial class MainViewModel : ObservableObject
     [RelayCommand]
     public void NewFolder()
     {
-        if (ActivePane.CurrentPath == "This PC" || ActivePane.IsOffline)
+        if (LocationRoots.IsVirtual(ActivePane.CurrentPath) || ActivePane.IsOffline)
         {
             return;
         }
@@ -317,12 +323,12 @@ public sealed partial class MainViewModel : ObservableObject
     public async Task BuildIndexAsync()
     {
         var path = ActivePane.CurrentPath;
-        if (path == "This PC")
+        if (LocationRoots.IsVirtual(path))
         {
             path = ActivePane.SelectedItems.FirstOrDefault()?.FullPath ?? "";
         }
 
-        if (string.IsNullOrWhiteSpace(path) || path == "This PC")
+        if (string.IsNullOrWhiteSpace(path) || LocationRoots.IsVirtual(path))
         {
             Footer = "Select a drive or folder to index.";
             return;
@@ -351,6 +357,59 @@ public sealed partial class MainViewModel : ObservableObject
         var path = ActivePane.SelectedItems.FirstOrDefault()?.FullPath ?? ActivePane.CurrentPath;
         ShowCloudPin = _providers.HasCapability(path, ProviderCapability.Pin);
         ShowCloudDehydrate = _providers.HasCapability(path, ProviderCapability.Dehydrate);
+        _ = RefreshForgetActionAsync();
+    }
+
+    public async Task RefreshForgetActionAsync()
+    {
+        ShowForgetSource = ActivePane.CurrentPath is LocationRoots.ThisPc or LocationRoots.Network
+            && ActivePane.SelectedItems.Count == 1
+            && await _sources.CanForgetPathAsync(ActivePane.SelectedItems[0].FullPath).ConfigureAwait(true);
+    }
+
+    public async Task<bool> ForgetSourceAsync(string path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return false;
+        }
+
+        var name = Path.GetFileName(path.TrimEnd('\\'));
+        if (string.IsNullOrWhiteSpace(name))
+        {
+            name = path;
+        }
+
+        var removed = await _sources.ForgetDisconnectedAsync(path).ConfigureAwait(true);
+        if (!removed)
+        {
+            Footer = "This location is still connected in Windows, so Explorer keeps it.";
+            return false;
+        }
+
+        foreach (var tab in Tabs.ToList())
+        {
+            foreach (var pane in new[] { tab.Left, tab.Right })
+            {
+                if (pane.CurrentPath != "This PC"
+                    && (NavigationTreeViewModel.PathsEqual(pane.CurrentPath, path)
+                        || CloudPath.IsUnder(path, pane.CurrentPath)))
+                {
+                    await pane.NavigateAsync("This PC").ConfigureAwait(true);
+                }
+            }
+        }
+
+        await Tree.ReloadAsync("This PC").ConfigureAwait(true);
+        if (ActivePane.CurrentPath == "This PC")
+        {
+            await ActivePane.RefreshAsync().ConfigureAwait(true);
+        }
+
+        PathText = ActivePane.CurrentPath;
+        Footer = $"Removed {name} and its index data.";
+        ShowForgetSource = false;
+        return true;
     }
 
     [RelayCommand]
@@ -365,7 +424,7 @@ public sealed partial class MainViewModel : ObservableObject
     private async Task InvokeCloudAsync(ProviderAction action)
     {
         var paths = SelectedPaths();
-        if (paths.Count == 0 && ActivePane.CurrentPath != "This PC")
+        if (paths.Count == 0 && !LocationRoots.IsVirtual(ActivePane.CurrentPath))
         {
             paths = [ActivePane.CurrentPath];
         }
@@ -483,20 +542,51 @@ public sealed partial class MainViewModel : ObservableObject
         await Tree.ReloadAsync(ActivePane.CurrentPath).ConfigureAwait(true);
     }
 
-    public async Task AddCloudFolderAsync(string path, string? displayName = null)
+    public async Task AddCloudFolderAsync(string path, string? providerId = null, string? displayName = null)
     {
         if (string.IsNullOrWhiteSpace(path))
         {
             return;
         }
 
-        _cloudPlaces.Add(OneDriveProviderId, path, displayName);
+        var trimmed = path.Trim().TrimEnd('\\');
-        Footer = "Added OneDrive folder to the navigation tree.";
+        var id = providerId
-        await Tree.ReloadAsync(path.Trim().TrimEnd('\\')).ConfigureAwait(true);
+                 ?? _providers.Find(trimmed)?.Manifest.Id
-        await ActivePane.NavigateAsync(path).ConfigureAwait(true);
+                 ?? GuessCloudProvider(trimmed);
+        var name = string.IsNullOrWhiteSpace(displayName) ? CloudProviderLabel(id) : displayName;
+        _cloudPlaces.Add(id, trimmed, name);
+        Footer = $"Added {name} to the navigation tree.";
+        await Tree.ReloadAsync(trimmed).ConfigureAwait(true);
+        await ActivePane.NavigateAsync(trimmed).ConfigureAwait(true);
     }
 
-    private const string OneDriveProviderId = "onedrive";
+    public const string OneDriveProviderId = "onedrive";
+    public const string GoogleDriveProviderId = "googledrive";
+    public const string NextcloudProviderId = "nextcloud";
+
+    private static string GuessCloudProvider(string path)
+    {
+        if (path.Contains("Google Drive", StringComparison.OrdinalIgnoreCase)
+            || path.Contains(@"\My Drive", StringComparison.OrdinalIgnoreCase))
+        {
+            return GoogleDriveProviderId;
+        }
+
+        if (path.Contains("Nextcloud", StringComparison.OrdinalIgnoreCase)
+            || path.Contains("ownCloud", StringComparison.OrdinalIgnoreCase))
+        {
+            return NextcloudProviderId;
+        }
+
+        return OneDriveProviderId;
+    }
+
+    private static string CloudProviderLabel(string providerId) => providerId switch
+    {
+        GoogleDriveProviderId => "Google Drive",
+        NextcloudProviderId => "Nextcloud",
+        _ => "OneDrive"
+    };
 
     [RelayCommand]
     public Task SearchAsync()
@@ -513,6 +603,41 @@ public sealed partial class MainViewModel : ObservableObject
     [RelayCommand]
     public void ToggleTheme() => Theme = Theme == "Dark" ? "Light" : "Dark";
 
+    public UiPreferences CurrentPreferences()
+    {
+        var stored = _preferences.Load();
+        return stored with { Theme = UiPreferencesStore.NormalizeTheme(Theme) };
+    }
+
+    public async Task ApplyPreferencesAsync(UiPreferences preferences)
+    {
+        var normalized = preferences with { Theme = UiPreferencesStore.NormalizeTheme(preferences.Theme) };
+        _preferences.Save(normalized);
+        Theme = normalized.Theme;
+        await Tree.ReloadAsync(ActivePane.CurrentPath).ConfigureAwait(true);
+        foreach (var tab in Tabs)
+        {
+            foreach (var pane in new[] { tab.Left, tab.Right })
+            {
+                if (LocationRoots.IsVirtual(pane.CurrentPath))
+                {
+                    await pane.RefreshAsync().ConfigureAwait(true);
+                }
+            }
+        }
+
+        Footer = "Settings saved.";
+    }
+
+    partial void OnThemeChanged(string value)
+    {
+        var stored = _preferences.Load();
+        if (!stored.Theme.Equals(value, StringComparison.OrdinalIgnoreCase))
+        {
+            _preferences.Save(stored with { Theme = UiPreferencesStore.NormalizeTheme(value) });
+        }
+    }
+
     public async Task DropAsync(IReadOnlyList<string> files, string targetDirectory, bool move)
     {
         if (files.Count == 0)

src/Explorer.Presentation/ViewModels/NavigationTreeViewModel.cs

@@ -2,6 +2,7 @@ using System.Collections.ObjectModel;
 using CommunityToolkit.Mvvm.ComponentModel;
 using Explorer.Application;
 using Explorer.Domain;
+using Explorer.Plugin.Abstractions;
 
 namespace Explorer.Presentation.ViewModels;
 
@@ -18,6 +19,9 @@ public sealed partial class NavNodeViewModel : ObservableObject
     public ObservableCollection<NavNodeViewModel> Children { get; } = [];
     public string Glyph { get; init; } = "\uE8B7";
     public bool IsPlaceholder { get; init; }
+    public bool IsGroup { get; init; }
+    public long? SourceId { get; init; }
+    public bool CanRemove { get; init; }
 }
 
 public sealed class NavigationTreeViewModel
@@ -26,17 +30,20 @@ public sealed class NavigationTreeViewModel
     private readonly BrowseService _browse;
     private readonly StorageProviderRegistry _providers;
     private readonly CloudPlaceStore _cloudPlaces;
+    private readonly UiPreferencesStore _preferences;
 
     public NavigationTreeViewModel(
         SourceManager sources,
         BrowseService browse,
         StorageProviderRegistry providers,
-        CloudPlaceStore cloudPlaces)
+        CloudPlaceStore cloudPlaces,
+        UiPreferencesStore preferences)
     {
         _sources = sources;
         _browse = browse;
         _providers = providers;
         _cloudPlaces = cloudPlaces;
+        _preferences = preferences;
         Roots = [];
     }
 
@@ -55,47 +62,80 @@ public sealed class NavigationTreeViewModel
         try
         {
             Roots.Clear();
-            var thisPc = new NavNodeViewModel { Label = "This PC", Path = "This PC", Glyph = "\uE977", IsExpanded = true, ChildrenLoaded = true };
+            var prefs = _preferences.Load();
+            var thisPc = new NavNodeViewModel
+            {
+                Label = LocationRoots.ThisPc,
+                Path = LocationRoots.ThisPc,
+                Glyph = "\uE977",
+                IsExpanded = true,
+                ChildrenLoaded = true,
+                IsGroup = true
+            };
             Roots.Add(thisPc);
 
             var sources = await _sources.RefreshOnlineStateAsync(cancellationToken).ConfigureAwait(true);
-            foreach (var source in sources)
+            foreach (var source in sources.Where(s => !s.Kind.IsNetwork()))
             {
-                var node = new NavNodeViewModel
+                thisPc.Children.Add(CreateSourceNode(source, _sources.CanForget(source)));
-                {
-                    Label = source.DisplayName,
-                    Path = source.LastRootPath ?? source.DisplayName,
-                    Status = source.Status switch
-                    {
-                        SourceStatus.Offline => source.LastSeenUtc is null
-                            ? "Offline"
-                            : $"Offline · Last seen {source.LastSeenUtc.Value.ToLocalTime():d}",
-                        SourceStatus.Scanning => "Indexing",
-                        SourceStatus.Stale => "May be out of date",
-                        SourceStatus.Error => "Error",
-                        _ => source.IsIndexed ? "Indexed" : ""
-                    },
-                    IsOffline = source.Status == SourceStatus.Offline,
-                    Glyph = source.Kind == SourceKind.Removable ? "\uE88E" : source.Kind == SourceKind.Smb ? "\uE968" : "\uEDA2"
-                };
-                AddPlaceholder(node);
-                thisPc.Children.Add(node);
             }
 
-            foreach (var place in CloudPlaceStore.Merge(_providers.GetPlaces(), _cloudPlaces.Load())
+            var network = sources.Where(s => s.Kind.IsNetwork()).ToList();
-                         .OrderBy(p => p.DisplayName, StringComparer.CurrentCultureIgnoreCase))
+            if (prefs.GroupNetworkPlaces && network.Count > 0)
             {
-                var exists = Directory.Exists(place.Path);
+                var group = new NavNodeViewModel
-                var node = new NavNodeViewModel
                 {
-                    Label = place.DisplayName,
+                    Label = LocationRoots.Network,
-                    Path = place.Path,
+                    Path = LocationRoots.Network,
-                    Glyph = "\uE753",
+                    Glyph = "\uE968",
-                    Status = exists ? "" : "Offline",
+                    IsExpanded = true,
-                    IsOffline = !exists
+                    ChildrenLoaded = true,
+                    IsGroup = true
                 };
-                AddPlaceholder(node);
+                foreach (var source in network)
-                Roots.Add(node);
+                {
+                    group.Children.Add(CreateSourceNode(source, _sources.CanForget(source)));
+                }
+
+                Roots.Add(group);
+            }
+            else
+            {
+                foreach (var source in network)
+                {
+                    Roots.Add(CreateSourceNode(source, _sources.CanForget(source)));
+                }
+            }
+
+            var places = CloudPlaceStore.Merge(_providers.GetPlaces(), _cloudPlaces.Load())
+                .OrderBy(p => ProviderOrder(p.ProviderId))
+                .ThenBy(p => p.DisplayName, StringComparer.CurrentCultureIgnoreCase)
+                .Select(CreateCloudNode)
+                .ToList();
+            if (prefs.GroupCloudPlaces && places.Count > 0)
+            {
+                var group = new NavNodeViewModel
+                {
+                    Label = LocationRoots.Cloud,
+                    Path = LocationRoots.Cloud,
+                    Glyph = "\uE753",
+                    IsExpanded = true,
+                    ChildrenLoaded = true,
+                    IsGroup = true
+                };
+                foreach (var place in places)
+                {
+                    group.Children.Add(place);
+                }
+
+                Roots.Add(group);
+            }
+            else
+            {
+                foreach (var place in places)
+                {
+                    Roots.Add(place);
+                }
             }
 
             foreach (var path in expanded)
@@ -123,7 +163,7 @@ public sealed class NavigationTreeViewModel
 
     public async Task EnsureChildrenAsync(NavNodeViewModel node)
     {
-        if (node.IsPlaceholder || node.ChildrenLoaded || node.Path == "This PC")
+        if (node.IsPlaceholder || node.ChildrenLoaded || node.IsGroup || LocationRoots.IsVirtual(node.Path))
         {
             return;
         }
@@ -155,13 +195,13 @@ public sealed class NavigationTreeViewModel
         IsRevealing = true;
         try
         {
-            if (PathsEqual(path, "This PC"))
+            if (LocationRoots.IsVirtual(path))
             {
-                var thisPc = Roots.FirstOrDefault(r => r.Path == "This PC");
+                var virtualRoot = Roots.FirstOrDefault(r => r.Path == path);
-                if (thisPc is not null)
+                if (virtualRoot is not null)
                 {
-                    thisPc.IsExpanded = true;
+                    virtualRoot.IsExpanded = true;
-                    SelectOnly(thisPc);
+                    SelectOnly(virtualRoot);
                 }
                 return;
             }
@@ -224,6 +264,61 @@ public sealed class NavigationTreeViewModel
             StringComparison.OrdinalIgnoreCase);
     }
 
+    private static NavNodeViewModel CreateCloudNode(ProviderPlace place)
+    {
+        var exists = Directory.Exists(place.Path);
+        var node = new NavNodeViewModel
+        {
+            Label = place.DisplayName,
+            Path = place.Path,
+            Glyph = place.Glyph ?? CloudGlyph(place.ProviderId),
+            Status = exists ? "" : "Offline",
+            IsOffline = !exists
+        };
+        AddPlaceholder(node);
+        return node;
+    }
+
+    private static NavNodeViewModel CreateSourceNode(Source source, bool canRemove)
+    {
+        var node = new NavNodeViewModel
+        {
+            Label = source.DisplayName,
+            Path = source.LastRootPath ?? source.DisplayName,
+            Status = source.Status switch
+            {
+                SourceStatus.Offline => source.LastSeenUtc is null
+                    ? "Offline"
+                    : $"Offline · Last seen {source.LastSeenUtc.Value.ToLocalTime():d}",
+                SourceStatus.Scanning => "Indexing",
+                SourceStatus.Stale => "May be out of date",
+                SourceStatus.Error => "Error",
+                _ => source.IsIndexed ? "Indexed" : ""
+            },
+            IsOffline = source.Status == SourceStatus.Offline,
+            Glyph = source.Kind == SourceKind.Removable ? "\uE88E" : source.Kind.IsNetwork() ? "\uE968" : "\uEDA2",
+            SourceId = source.Id,
+            CanRemove = canRemove
+        };
+        AddPlaceholder(node);
+        return node;
+    }
+
+    private static int ProviderOrder(string providerId) => providerId switch
+    {
+        "onedrive" => 0,
+        "googledrive" => 1,
+        "nextcloud" => 2,
+        _ => 9
+    };
+
+    private static string CloudGlyph(string providerId) => providerId switch
+    {
+        "googledrive" => "\uE753",
+        "nextcloud" => "\uE753",
+        _ => "\uE753"
+    };
+
     private static NavNodeViewModel? FindBestRoot(IEnumerable<NavNodeViewModel> roots, string path)
     {
         var normalized = PathRules.FromExtended(path).TrimEnd('\\');
@@ -232,7 +327,7 @@ public sealed class NavigationTreeViewModel
 
         void Consider(NavNodeViewModel node)
         {
-            if (node.IsPlaceholder || node.Path == "This PC")
+            if (node.IsPlaceholder || node.IsGroup || LocationRoots.IsVirtual(node.Path))
             {
                 return;
             }
@@ -251,11 +346,11 @@ public sealed class NavigationTreeViewModel
 
         foreach (var root in roots)
         {
-            if (root.Path == "This PC")
+            if (root.IsGroup || LocationRoots.IsVirtual(root.Path))
             {
-                foreach (var drive in root.Children.Where(c => !c.IsPlaceholder))
+                foreach (var child in root.Children.Where(c => !c.IsPlaceholder))
                 {
-                    Consider(drive);
+                    Consider(child);
                 }
             }
             else

src/Explorer.Storage.Sqlite/EntryStore.cs

@@ -176,6 +176,25 @@ internal sealed class EntryStore : IEntryStore
             conn, "UPDATE entries SET status=0 WHERE source_id=@sourceId AND status=1",
             new { sourceId }), cancellationToken);
 
+    public Task TombstoneByPathPrefixAsync(long sourceId, string pathRelPrefix, DateTimeOffset utc, CancellationToken cancellationToken = default)
+        => _store.WriteAsync(conn =>
+        {
+            if (string.IsNullOrEmpty(pathRelPrefix))
+            {
+                return Task.CompletedTask;
+            }
+
+            return SqliteExec.ExecuteAsync(conn, """
+                UPDATE entries SET status=2, deleted_utc=@utc
+                WHERE source_id=@sourceId AND status=0 AND path_rel LIKE @like ESCAPE '\'
+                """, new
+            {
+                sourceId,
+                utc = utc.ToString("O"),
+                like = EscapeLike(pathRelPrefix) + "\\\\%"
+            });
+        }, cancellationToken);
+
     public Task TombstoneAsync(long id, DateTimeOffset utc, CancellationToken cancellationToken = default)
         => _store.WriteAsync(async conn =>
         {

src/Explorer.Storage.Sqlite/Explorer.Storage.Sqlite.csproj

@@ -5,6 +5,7 @@
   <ItemGroup>
     <PackageReference Include="Dapper" Version="2.1.66" />
     <PackageReference Include="Microsoft.Data.Sqlite" Version="10.0.2" />
+    <PackageReference Include="SQLitePCLRaw.lib.e_sqlite3" Version="2.1.12" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.0" />
   </ItemGroup>
   <ItemGroup>

src/Explorer.Storage.Sqlite/SourceStore.cs

@@ -111,6 +111,26 @@ internal sealed class SourceStore : ISourceStore
             "UPDATE sources SET last_root_path=@rootPath, last_seen_utc=@utc WHERE id=@id",
             new { id, rootPath, utc = utc.ToString("O") }), cancellationToken);
 
+    public Task DeleteAsync(long id, CancellationToken cancellationToken = default)
+        => _store.WriteAsync(async conn =>
+        {
+            await SqliteExec.ExecuteAsync(conn, "PRAGMA defer_foreign_keys = ON").ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, """
+                DELETE FROM hash_queue
+                WHERE entry_id IN (SELECT id FROM entries WHERE source_id = @id)
+                """, new { id }).ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, "DELETE FROM entries WHERE source_id = @id", new { id }).ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, "DELETE FROM excludes WHERE source_id = @id", new { id }).ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, """
+                DELETE FROM scan_errors
+                WHERE job_id IN (SELECT id FROM scan_jobs WHERE source_id = @id)
+                """, new { id }).ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, "DELETE FROM scan_jobs WHERE source_id = @id", new { id }).ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, "DELETE FROM source_stats_history WHERE source_id = @id", new { id }).ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, "DELETE FROM directory_stats_history WHERE source_id = @id", new { id }).ConfigureAwait(false);
+            await SqliteExec.ExecuteAsync(conn, "DELETE FROM sources WHERE id = @id", new { id }).ConfigureAwait(false);
+        }, cancellationToken);
+
     private static object ToArgs(Source s) => new
     {
         s.Id,

src/Explorer.Windows/WindowsSyncRootDiscovery.cs

@@ -0,0 +1,59 @@
+using Microsoft.Win32;
+
+namespace Explorer.Windows;
+
+public sealed record WindowsSyncRoot(string Id, string Path, string? DisplayName);
+
+public static class WindowsSyncRootDiscovery
+{
+    public static IReadOnlyList<WindowsSyncRoot> Enumerate()
+    {
+        var found = new List<WindowsSyncRoot>();
+        foreach (var hive in new[] { Registry.CurrentUser, Registry.LocalMachine })
+        {
+            try
+            {
+                using var root = hive.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Explorer\SyncRootManager");
+                if (root is null)
+                {
+                    continue;
+                }
+
+                foreach (var id in root.GetSubKeyNames())
+                {
+                    using var key = root.OpenSubKey(id);
+                    if (key is null)
+                    {
+                        continue;
+                    }
+
+                    var display = key.GetValue("DisplayNameResource") as string;
+                    using var userRoots = key.OpenSubKey("UserSyncRoots");
+                    if (userRoots is null)
+                    {
+                        continue;
+                    }
+
+                    foreach (var valueName in userRoots.GetValueNames())
+                    {
+                        if (userRoots.GetValue(valueName) is string path && !string.IsNullOrWhiteSpace(path))
+                        {
+                            found.Add(new WindowsSyncRoot(id, path.Trim().TrimEnd('\\'), display));
+                        }
+                    }
+                }
+            }
+            catch
+            {
+                // registry is optional
+            }
+        }
+
+        return found;
+    }
+
+    public static IEnumerable<WindowsSyncRoot> Matching(params string[] tokens)
+        => Enumerate().Where(root => tokens.Any(token =>
+            root.Id.Contains(token, StringComparison.OrdinalIgnoreCase)
+            || (root.DisplayName?.Contains(token, StringComparison.OrdinalIgnoreCase) ?? false)));
+}

tests/Explorer.Application.Tests/BrowseServiceTests.cs

@@ -95,7 +95,9 @@ public class BrowseServiceTests
             volumes,
             store,
             sources,
-            new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance));
+            new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance),
+            new CloudPlaceStore(env),
+            new UiPreferencesStore(env));
         return (browse, store);
     }
 }

tests/Explorer.Application.Tests/CloudProviderTests.cs

@@ -1,6 +1,8 @@
 using Explorer.Application;
 using Explorer.Domain;
 using Explorer.Plugin.Abstractions;
+using Explorer.Plugin.GoogleDrive;
+using Explorer.Plugin.Nextcloud;
 using Explorer.Plugin.OneDrive;
 using Microsoft.Extensions.Logging.Abstractions;
 
@@ -104,6 +106,111 @@ public class CloudProviderTests
         Assert.Equal("Dominique - Personal", merged[0].DisplayName);
         Assert.Equal(@"C:\Users\x\OneDrive - Contoso", merged[1].Path);
     }
+
+    [Fact]
+    public void Cloud_path_is_under_is_prefix_safe()
+    {
+        Assert.True(CloudPath.IsUnder(@"F:\OneDrive - wyniger", @"F:\OneDrive - wyniger\Obsidian\Notes"));
+        Assert.False(CloudPath.IsUnder(@"F:\OneDrive", @"F:\OneDrive - wyniger"));
+        Assert.True(CloudPath.IsUnder(@"J:\", @"J:\My Drive\Photos"));
+        Assert.Equal(@"J:\", CloudPath.NormalizePlace("j:"));
+        Assert.Equal(@"J:\", CloudPath.NormalizePlace(@"J:\"));
+    }
+
+    [Fact]
+    public void DriveFS_media_named_google_drive_becomes_a_place()
+    {
+        var places = DriveFsPreferenceReader.PlacesFromTables(
+            [
+                new("Games", @"D:\", 4),
+                new("Google Drive", @"J:\", 10),
+                new("MP3", @"G:\", 4)
+            ],
+            [
+                new("My Drive", @"My Drive", @"J:\My Drive", true)
+            ]);
+        Assert.Single(places);
+        Assert.Equal("googledrive", places[0].ProviderId);
+        Assert.Equal("Google Drive", places[0].DisplayName);
+        Assert.Equal(@"J:\", places[0].Path);
+    }
+
+    [Fact]
+    public void DriveFS_mirrored_folder_becomes_a_place_when_no_mount()
+    {
+        var places = DriveFsPreferenceReader.PlacesFromTables(
+            [new("Data", @"F:\", 4)],
+            [new("Photos", @"Photos", @"F:\Google Photos", false)]);
+        Assert.Single(places);
+        Assert.Equal("Google Drive - Photos", places[0].DisplayName);
+        Assert.Equal(@"F:\Google Photos", places[0].Path);
+    }
+
+    [Fact]
+    public void DriveFS_local_preference_db_exposes_configured_mount()
+    {
+        if (!File.Exists(DriveFsPreferenceReader.DefaultDatabasePath))
+        {
+            return;
+        }
+
+        var places = DriveFsPreferenceReader.ReadPlaces();
+        Assert.Contains(places, p => p.DisplayName == "Google Drive" && p.Path.Length >= 2);
+    }
+
+    [Theory]
+    [InlineData(@"C:\Users\x\My Drive", "Google Drive")]
+    [InlineData(@"G:\Shared drives", "Shared drives")]
+    [InlineData(@"D:\Work", "Google Drive - Work")]
+    public void Google_drive_place_label(string path, string expected)
+        => Assert.Equal(expected, GoogleDrivePlaceDiscovery.BuildLabel(path, null));
+
+    [Fact]
+    public void Nextcloud_parses_account_folders_from_cfg()
+    {
+        const string cfg = """
+            [Accounts]
+            0\url=https://cloud.example.com
+            0\displayName=Dominique Wyniger
+            0\Folders\1\localPath=F:/OneDrive - wyniger/Obsidian/Notes/
+            0\Folders\1\targetPath=/Notizen/Notes
+            0\Folders\1\virtualFilesMode=off
+            """;
+        var places = NextcloudPlaceDiscovery.ParseCfg(cfg);
+        Assert.Single(places);
+        Assert.Equal("nextcloud", places[0].ProviderId);
+        Assert.Equal(@"F:\OneDrive - wyniger\Obsidian\Notes", places[0].Path);
+        Assert.Equal("Nextcloud - Notes", places[0].DisplayName);
+    }
+
+    [Fact]
+    public void OneDrive_does_not_claim_google_drive_paths()
+    {
+        Assert.False(OneDriveStorageProvider.LooksLikeOneDrive(@"G:\My Drive\Photos"));
+        Assert.True(GoogleDriveStorageProvider.LooksLikeGoogleDrive(@"G:\My Drive\Photos"));
+    }
+
+    [Fact]
+    public void Discover_skips_missing_default_profile_folders()
+    {
+        var profile = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+        var google = GoogleDrivePlaceDiscovery.Discover();
+        var nextcloud = NextcloudPlaceDiscovery.Discover();
+        AssertMissingGuess(google, Path.Combine(profile, "Google Drive"));
+        AssertMissingGuess(google, Path.Combine(profile, "My Drive"));
+        AssertMissingGuess(nextcloud, Path.Combine(profile, "Nextcloud"));
+        AssertMissingGuess(nextcloud, Path.Combine(profile, "ownCloud"));
+    }
+
+    private static void AssertMissingGuess(IReadOnlyList<ProviderPlace> places, string path)
+    {
+        if (Directory.Exists(path))
+        {
+            return;
+        }
+
+        Assert.DoesNotContain(places, p => p.Path.Equals(path.TrimEnd('\\'), StringComparison.OrdinalIgnoreCase));
+    }
 }
 
 file static class CloudFilesNativeStates

tests/Explorer.Application.Tests/Explorer.Application.Tests.csproj

@@ -14,6 +14,8 @@
     <ProjectReference Include="..\..\src\Explorer.Application\Explorer.Application.csproj" />
     <ProjectReference Include="..\..\src\Explorer.Domain\Explorer.Domain.csproj" />
     <ProjectReference Include="..\..\src\Explorer.Plugin.Abstractions\Explorer.Plugin.Abstractions.csproj" />
+    <ProjectReference Include="..\..\src\Explorer.Plugin.GoogleDrive\Explorer.Plugin.GoogleDrive.csproj" />
+    <ProjectReference Include="..\..\src\Explorer.Plugin.Nextcloud\Explorer.Plugin.Nextcloud.csproj" />
     <ProjectReference Include="..\..\src\Explorer.Plugin.OneDrive\Explorer.Plugin.OneDrive.csproj" />
     <ProjectReference Include="..\..\src\Explorer.Indexing\Explorer.Indexing.csproj" />
     <ProjectReference Include="..\..\src\Explorer.Storage.Sqlite\Explorer.Storage.Sqlite.csproj" />

tests/Explorer.Application.Tests/SourceManagerTests.cs

@@ -90,6 +90,68 @@ public class SourceManagerTests
         var found = await mgr.FindByPathAsync(@"Z:\");
         Assert.Equal(source.Id, found!.Id);
     }
+
+    [Fact]
+    public async Task Forget_removes_disconnected_source_and_index_rows()
+    {
+        var db = Path.Combine(Path.GetTempPath(), "ew-app", Guid.NewGuid().ToString("N"), "index.db");
+        await using var store = new SqliteIndexStore(db, NullLogger<SqliteIndexStore>.Instance);
+        await store.OpenAsync();
+        var volumes = new FakeVolumes
+        {
+            Online =
+            [
+                new VolumeFingerprint
+                {
+                    Kind = SourceKind.Smb,
+                    RootPath = @"Z:\",
+                    DisplayName = "Z: (Network)",
+                    Filesystem = "SMB"
+                }
+            ]
+        };
+        var env = new FakeEnv(Path.GetDirectoryName(db)!);
+        var mgr = new SourceManager(store, volumes, env, new SystemClock(), NullLogger<SourceManager>.Instance);
+        await mgr.InitializeAsync();
+        var source = (await store.Sources.GetAllAsync()).Single();
+        await store.Entries.UpsertAsync(new IndexEntry
+        {
+            SourceId = source.Id,
+            Name = "Photos",
+            NameNorm = "photos",
+            IsDirectory = true,
+            PathRel = "Photos",
+            LastSeenUtc = DateTimeOffset.UtcNow
+        });
+
+        Assert.False(mgr.CanForget(source));
+        Assert.False(await mgr.ForgetDisconnectedAsync(@"Z:\"));
+
+        volumes.Online = [];
+        await mgr.RefreshOnlineStateAsync();
+        source = (await store.Sources.GetAllAsync()).Single();
+        Assert.True(mgr.CanForget(source));
+        Assert.True(await mgr.ForgetDisconnectedAsync(@"Z:\"));
+        Assert.Empty(await store.Sources.GetAllAsync());
+        Assert.Null(await store.Entries.GetRootAsync(source.Id));
+    }
+
+    [Fact]
+    public async Task Forget_removes_unc_from_recents()
+    {
+        var dir = Path.Combine(Path.GetTempPath(), "ew-app", Guid.NewGuid().ToString("N"));
+        var db = Path.Combine(dir, "index.db");
+        await using var store = new SqliteIndexStore(db, NullLogger<SqliteIndexStore>.Instance);
+        var volumes = new FakeVolumes();
+        var env = new FakeEnv(dir);
+        File.WriteAllLines(Path.Combine(dir, "recents.txt"), [@"\\old-server\share"]);
+        var mgr = new SourceManager(store, volumes, env, new SystemClock(), NullLogger<SourceManager>.Instance);
+        await mgr.InitializeAsync();
+        Assert.Single(await store.Sources.GetAllAsync());
+        Assert.True(await mgr.ForgetDisconnectedAsync(@"\\old-server\share"));
+        Assert.Empty(await store.Sources.GetAllAsync());
+        Assert.Empty(File.ReadAllLines(Path.Combine(dir, "recents.txt")));
+    }
 }
 
 file sealed class FakeVolumes : IVolumeService

tests/Explorer.Application.Tests/UiPreferencesStoreTests.cs

@@ -0,0 +1,69 @@
+using Explorer.Application;
+using Explorer.Domain.Abstractions;
+
+namespace Explorer.Application.Tests;
+
+public class UiPreferencesStoreTests
+{
+    [Fact]
+    public void Parse_reads_theme_and_independent_group_flags()
+    {
+        var prefs = UiPreferencesStore.Parse(
+        [
+            "theme=Light",
+            "group-network=true",
+            "group-cloud=false",
+            "index-archives=true"
+        ]);
+        Assert.Equal("Light", prefs.Theme);
+        Assert.True(prefs.GroupNetworkPlaces);
+        Assert.False(prefs.GroupCloudPlaces);
+        Assert.True(prefs.IndexArchiveContents);
+    }
+
+    [Fact]
+    public void Parse_defaults_missing_keys()
+    {
+        var prefs = UiPreferencesStore.Parse(["theme=dark"]);
+        Assert.Equal("Dark", prefs.Theme);
+        Assert.False(prefs.GroupNetworkPlaces);
+        Assert.False(prefs.GroupCloudPlaces);
+        Assert.False(prefs.IndexArchiveContents);
+    }
+
+    [Fact]
+    public void Load_and_save_roundtrip()
+    {
+        var dir = Path.Combine(Path.GetTempPath(), "ew-ui-prefs", Guid.NewGuid().ToString("N"));
+        try
+        {
+            var store = new UiPreferencesStore(new PrefsEnv(dir));
+            store.Save(new UiPreferences("Light", true, false, true));
+            var loaded = store.Load();
+            Assert.Equal("Light", loaded.Theme);
+            Assert.True(loaded.GroupNetworkPlaces);
+            Assert.False(loaded.GroupCloudPlaces);
+            Assert.True(loaded.IndexArchiveContents);
+        }
+        finally
+        {
+            try { Directory.Delete(dir, true); } catch { /* ignore */ }
+        }
+    }
+}
+
+file sealed class PrefsEnv : IAppEnvironment
+{
+    public PrefsEnv(string dir)
+    {
+        DataDirectory = dir;
+        Directory.CreateDirectory(dir);
+        DatabasePath = Path.Combine(dir, "index.db");
+        LogDirectory = Path.Combine(dir, "logs");
+        Directory.CreateDirectory(LogDirectory);
+    }
+
+    public string DataDirectory { get; }
+    public string DatabasePath { get; }
+    public string LogDirectory { get; }
+}

tests/Explorer.Domain.Tests/DomainTests.cs

@@ -43,6 +43,9 @@ public class PathRulesTests
         Assert.Equal(@"Windows\System32", PathRules.MakeRelative(@"C:\", @"C:\Windows\System32"));
         Assert.Equal(@"C:\Windows", PathRules.Parent(@"C:\Windows\System32"));
         Assert.Equal(@"C:\", PathRules.Parent(@"C:\Windows"));
+        Assert.Equal(@"pack.zip\docs", PathRules.RelativeParent(@"pack.zip\docs\a.txt"));
+        Assert.Equal("pack.zip", PathRules.RelativeParent(@"pack.zip\docs"));
+        Assert.Equal("", PathRules.RelativeParent("pack.zip"));
     }
 
     [Fact]
@@ -62,6 +65,31 @@ public class PathRulesTests
     }
 }
 
+public class ArchiveFormatsTests
+{
+    [Fact]
+    public void Detects_common_archive_extensions()
+    {
+        Assert.True(ArchiveFormats.IsArchive("pack.zip"));
+        Assert.True(ArchiveFormats.IsArchive("film.7z"));
+        Assert.True(ArchiveFormats.IsArchive("backup.rar"));
+        Assert.True(ArchiveFormats.IsArchive("src.tar.gz"));
+        Assert.True(ArchiveFormats.IsZipFamily("photos.cbz"));
+        Assert.False(ArchiveFormats.IsArchive("notes.txt"));
+        Assert.False(ArchiveFormats.IsArchive("report.docx"));
+    }
+
+    [Fact]
+    public void Rejects_unsafe_archive_entry_paths()
+    {
+        Assert.True(ArchiveFormats.TryNormalizeEntryPath("docs/a.txt", out var ok));
+        Assert.Equal(@"docs\a.txt", ok);
+        Assert.False(ArchiveFormats.TryNormalizeEntryPath(@"..\escape.txt", out _));
+        Assert.False(ArchiveFormats.TryNormalizeEntryPath(@"C:\abs.txt", out _));
+        Assert.False(ArchiveFormats.TryNormalizeEntryPath("/", out _));
+    }
+}
+
 public class VolumeIdentityTests
 {
     [Fact]

tests/Explorer.Indexing.Tests/ScannerTests.cs

@@ -161,6 +161,107 @@ public class ScannerTests
         }
     }
 
+    [Fact]
+    public async Task Full_scan_indexes_archive_members_without_double_counting_folder_size()
+    {
+        var root = CreateTree();
+        var zipPath = Path.Combine(root, "pack.zip");
+        CreateZip(zipPath, ("docs/inner.txt", new string('x', 40)));
+        try
+        {
+            await using var store = await OpenStore();
+            var source = await AddSource(store, root);
+            var indexer = CreateIndexer(store, enabled: true);
+            var scanner = new FilesystemScanner(store, new IoEnumerator(), new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance), NullLogger<FilesystemScanner>.Instance, indexer);
+            await scanner.ScanAsync(source, ScanKind.Full, null, null, CancellationToken.None);
+
+            var inner = await store.Entries.GetByPathAsync(source.Id, @"pack.zip\docs\inner.txt");
+            Assert.NotNull(inner);
+            Assert.Equal(40, inner.SizeBytes);
+            Assert.False(inner.IsDirectory);
+
+            var zip = await store.Entries.GetByPathAsync(source.Id, "pack.zip");
+            Assert.NotNull(zip);
+            Assert.False(zip.IsDirectory);
+            Assert.Equal(new FileInfo(zipPath).Length, zip.SizeBytes);
+
+            var scanRoot = await store.Entries.GetRootAsync(source.Id);
+            Assert.Equal(100 + 50 + zip.SizeBytes, scanRoot!.AggregateSize);
+        }
+        finally
+        {
+            TryDelete(root);
+        }
+    }
+
+    [Fact]
+    public async Task Full_scan_skips_archive_contents_when_setting_is_off()
+    {
+        var root = CreateTree();
+        CreateZip(Path.Combine(root, "pack.zip"), ("inner.txt", "hello"));
+        try
+        {
+            await using var store = await OpenStore();
+            var source = await AddSource(store, root);
+            var scanner = new FilesystemScanner(store, new IoEnumerator(), new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance), NullLogger<FilesystemScanner>.Instance);
+            await scanner.ScanAsync(source, ScanKind.Full, null, null, CancellationToken.None);
+            Assert.Null(await store.Entries.GetByPathAsync(source.Id, @"pack.zip\inner.txt"));
+            Assert.NotNull(await store.Entries.GetByPathAsync(source.Id, "pack.zip"));
+        }
+        finally
+        {
+            TryDelete(root);
+        }
+    }
+
+    [Fact]
+    public async Task Folder_reconcile_tombs_archive_members_when_zip_is_removed()
+    {
+        var root = CreateTree();
+        var zipPath = Path.Combine(root, "pack.zip");
+        CreateZip(zipPath, ("inner.txt", "hello"));
+        try
+        {
+            await using var store = await OpenStore();
+            var source = await AddSource(store, root);
+            var indexer = CreateIndexer(store, enabled: true);
+            var scanner = new FilesystemScanner(store, new IoEnumerator(), new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance), NullLogger<FilesystemScanner>.Instance, indexer);
+            await scanner.ScanAsync(source, ScanKind.Full, null, null, CancellationToken.None);
+            File.Delete(zipPath);
+            var reconciler = new FolderReconciler(store, new IoEnumerator(), new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance), indexer);
+            await reconciler.ReconcileAsync(source, "", CancellationToken.None);
+            var zip = await store.Entries.GetByPathAsync(source.Id, "pack.zip");
+            var inner = await store.Entries.GetByPathAsync(source.Id, @"pack.zip\inner.txt");
+            Assert.Equal(EntryStatus.Deleted, zip!.Status);
+            Assert.Equal(EntryStatus.Deleted, inner!.Status);
+        }
+        finally
+        {
+            TryDelete(root);
+        }
+    }
+
+    [Fact]
+    public void Archive_catalog_lists_zip_entry_sizes_without_extracting()
+    {
+        var dir = Path.Combine(Path.GetTempPath(), "ew-scan", Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(dir);
+        var zipPath = Path.Combine(dir, "pack.zip");
+        CreateZip(zipPath, ("docs/inner.txt", new string('z', 25)));
+        try
+        {
+            var members = new ArchiveCatalog().TryList(zipPath);
+            var inner = Assert.Single(members, m => m.RelativePath.Equals(@"docs\inner.txt", StringComparison.OrdinalIgnoreCase));
+            Assert.False(inner.IsDirectory);
+            Assert.Equal(25, inner.SizeBytes);
+            Assert.DoesNotContain(Directory.GetFiles(dir, "*", SearchOption.AllDirectories), p => p.EndsWith("inner.txt", StringComparison.OrdinalIgnoreCase) && !p.EndsWith(".zip", StringComparison.OrdinalIgnoreCase));
+        }
+        finally
+        {
+            TryDelete(dir);
+        }
+    }
+
     [Fact]
     public async Task Folder_reconcile_tombs_removed_file()
     {
@@ -218,4 +319,46 @@ public class ScannerTests
     {
         try { Directory.Delete(root, true); } catch { /* ignore */ }
     }
+
+    private static void CreateZip(string zipPath, params (string Name, string Content)[] files)
+    {
+        using var zip = System.IO.Compression.ZipFile.Open(zipPath, System.IO.Compression.ZipArchiveMode.Create);
+        foreach (var (name, content) in files)
+        {
+            var entry = zip.CreateEntry(name);
+            using var stream = entry.Open();
+            using var writer = new StreamWriter(stream);
+            writer.Write(content);
+        }
+    }
+
+    private static ArchiveContentsIndexer CreateIndexer(IIndexStore store, bool enabled)
+    {
+        var dir = Path.Combine(Path.GetTempPath(), "ew-scan-prefs", Guid.NewGuid().ToString("N"));
+        var prefs = new UiPreferencesStore(new ScanPrefsEnv(dir));
+        prefs.Save(new UiPreferences("Dark", false, false, enabled));
+        return new ArchiveContentsIndexer(
+            store,
+            new IoEnumerator(),
+            new HydrationGuard(new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance)),
+            new ArchiveCatalog(),
+            prefs,
+            NullLogger<ArchiveContentsIndexer>.Instance);
+    }
+}
+
+file sealed class ScanPrefsEnv : IAppEnvironment
+{
+    public ScanPrefsEnv(string dir)
+    {
+        DataDirectory = dir;
+        Directory.CreateDirectory(dir);
+        DatabasePath = Path.Combine(dir, "index.db");
+        LogDirectory = Path.Combine(dir, "logs");
+        Directory.CreateDirectory(LogDirectory);
+    }
+
+    public string DataDirectory { get; }
+    public string DatabasePath { get; }
+    public string LogDirectory { get; }
 }