diff --git a/libs/os/path.h b/libs/os/path.h
index aef9ce14..6a8852da 100644
--- a/libs/os/path.h
+++ b/libs/os/path.h
@@ -185,6 +185,12 @@ inline bool extension_equal( const char* extension, const char* other ){
 	return string_equal_nocase( extension, other );
 }
 
+/// \brief Returns true if \p extension equals one of \p path. \p extension without period.
+/// O(n)
+inline bool path_extension_is( const char* path, const char* extension ){
+	return extension_equal( path_get_extension( path ), extension );
+}
+
 template<typename Functor>
 class MatchFileExtension
 {
diff --git a/plugins/assmodel/model.cpp b/plugins/assmodel/model.cpp
index bb496ca1..d7f5dc84 100644
--- a/plugins/assmodel/model.cpp
+++ b/plugins/assmodel/model.cpp
@@ -693,10 +693,9 @@ scene::Node& loadPicoModel( Assimp::Importer& importer, ArchiveFile& file ){
 	if( scene != nullptr ){
 		if( scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE )
 			globalWarningStream() << "AI_SCENE_FLAGS_INCOMPLETE\n";
-		const char *ext = path_get_extension( file.getName() );
 		const auto rootPath = StringOutputStream()( PathFilenameless( file.getName() ) );
 		const auto matName = StringOutputStream()( PathExtensionless( file.getName() ) );
-		return ( new PicoModelNode( AssScene{ scene, rootPath, string_equal_nocase( ext, "mdl" )? matName.c_str() : nullptr } ) )->node();
+		return ( new PicoModelNode( AssScene{ scene, rootPath, path_extension_is( file.getName(), "mdl" )? matName.c_str() : nullptr } ) )->node();
 	}
 	else{
 		return ( new PicoModelNode() )->node();
diff --git a/plugins/shaders/shaders.cpp b/plugins/shaders/shaders.cpp
index 9c8acff1..f12bf8e3 100644
--- a/plugins/shaders/shaders.cpp
+++ b/plugins/shaders/shaders.cpp
@@ -1580,7 +1580,7 @@ void BuildShaderList( TextInputStream& shaderlist ){
 	{
 		// each token should be a shader filename
 		shaderFile << token;
-		if( !string_equal_nocase( path_get_extension( token ), g_shadersExtension ) )
+		if( !path_extension_is( token, g_shadersExtension ) )
 			shaderFile << "." << g_shadersExtension;
 
 		ShaderList_addShaderFile( shaderFile.c_str() );
diff --git a/plugins/vfspk3/vfs.cpp b/plugins/vfspk3/vfs.cpp
index 7576fd69..c16f7672 100644
--- a/plugins/vfspk3/vfs.cpp
+++ b/plugins/vfspk3/vfs.cpp
@@ -187,7 +187,7 @@ public:
 			if ( subname[0] == '/' ) {
 				++subname;
 			}
-			if ( m_extension[0] == '*' || extension_equal( path_get_extension( subname ), m_extension ) ) {
+			if ( m_extension[0] == '*' || path_extension_is( subname, m_extension ) ) {
 				pathlist_append_unique( m_matches, subname );
 			}
 		}
diff --git a/radiant/environment.cpp b/radiant/environment.cpp
index d37941f2..da39ca9c 100644
--- a/radiant/environment.cpp
+++ b/radiant/environment.cpp
@@ -199,7 +199,7 @@ CopiedString g_openMapByCmd;
 
 void cmdMap(){
 	for ( int i = 1; i < g_argc; ++i )
-		if( extension_equal( path_get_extension( g_argv[i] ), "map" ) ){
+		if( path_extension_is( g_argv[i], "map" ) ){
 			g_openMapByCmd = StringOutputStream( 256 )( PathCleaned( g_argv[i] ) ).c_str();
 			return;
 		}
diff --git a/radiant/map.cpp b/radiant/map.cpp
index 84b2230c..b7e29c3b 100644
--- a/radiant/map.cpp
+++ b/radiant/map.cpp
@@ -1677,7 +1677,7 @@ bool Map_ImportFile( const char* filename ){
 
 	bool success = false;
 
-	if ( extension_equal( path_get_extension( filename ), "bsp" ) ) {
+	if ( path_extension_is( filename, "bsp" ) ) {
 		goto tryDecompile;
 	}
 
@@ -1713,37 +1713,25 @@ bool Map_ImportFile( const char* filename ){
 tryDecompile:
 
 	const char *type = GlobalRadiant().getGameDescriptionKeyValue( "q3map2_type" );
-	int n = string_length( path_get_extension( filename ) );
-	if ( n && ( extension_equal( path_get_extension( filename ), "bsp" ) || extension_equal( path_get_extension( filename ), "map" ) ) ) {
-		StringBuffer output;
-		output.push_string( AppPath_get() );
-		output.push_string( "q3map2." );
-		output.push_string( RADIANT_EXECUTABLE );
-		output.push_string( " -v -game " );
-		output.push_string( ( type && *type ) ? type : "quake3" );
-		output.push_string( " -fs_basepath \"" );
-		output.push_string( EnginePath_get() );
-		output.push_string( "\" -fs_homepath \"" );
-		output.push_string( g_qeglobals.m_userEnginePath.c_str() );
-		output.push_string( "\" -fs_game " );
-		output.push_string( gamename_get() );
-		output.push_string( " -convert -format " );
-		output.push_string( BrushType_getTexdefType( GlobalBrushCreator().getFormat() ) == TEXDEFTYPEID_QUAKE ? "map" : "map_bp" );
-		if ( extension_equal( path_get_extension( filename ), "map" ) ) {
-			output.push_string( " -readmap " );
+	if ( path_extension_is( filename, "bsp" ) || path_extension_is( filename, "map" ) ) {
+		StringOutputStream str( 256 );
+		str << AppPath_get() << "q3map2." << RADIANT_EXECUTABLE;
+		str << " -v -game " << ( ( type && *type ) ? type : "quake3" );
+		str << " -fs_basepath " << makeQuoted( EnginePath_get() );
+		str << " -fs_homepath " << makeQuoted( g_qeglobals.m_userEnginePath.c_str() );
+		str << " -fs_game " << gamename_get();
+		str << " -convert -format " << ( BrushType_getTexdefType( GlobalBrushCreator().getFormat() ) == TEXDEFTYPEID_QUAKE ? "map" : "map_bp" );
+		if ( path_extension_is( filename, "map" ) ) {
+			str << " -readmap ";
 		}
-		output.push_string( " \"" );
-		output.push_string( filename );
-		output.push_string( "\"" );
+		str << ' ' << makeQuoted( filename );
 
 		// run
-		Q_Exec( NULL, output.c_str(), NULL, false, true );
+		Q_Exec( NULL, str.c_str(), NULL, false, true );
 
 		// rebuild filename as "filenamewithoutext_converted.map"
-		output.clear();
-		output.push_range( filename, filename + string_length( filename ) - ( n + 1 ) );
-		output.push_string( "_converted.map" );
-		filename = output.c_str();
+		str( PathExtensionless( filename ), "_converted.map" );
+		filename = str.c_str();
 
 		EBrushType brush_type = GlobalBrushCreator().getFormat();
 		// open
diff --git a/radiant/modelwindow.cpp b/radiant/modelwindow.cpp
index 6b0edd1b..a678412b 100644
--- a/radiant/modelwindow.cpp
+++ b/radiant/modelwindow.cpp
@@ -1192,7 +1192,7 @@ public:
 		: m_modelExtensions( modelExtensions ),	m_modelFS( modelFS ), m_modelFoldersMap( modelFoldersMap ){
 	}
 	void visit( const char* name ) override {
-		if( m_modelExtensions.find( path_get_extension( name ) ) != m_modelExtensions.end() && ( !m_avoid_pk3dir || !string_in_string_nocase( name, ".pk3dir/" ) ) ){
+		if( m_modelExtensions.count( path_get_extension( name ) ) && ( !m_avoid_pk3dir || !string_in_string_nocase( name, ".pk3dir/" ) ) ){
 			m_modelFS.insert( name );
 //%			globalOutputStream() << name << " name\n";
 		}
diff --git a/radiant/preferences.cpp b/radiant/preferences.cpp
index 1b2f7876..328ae584 100644
--- a/radiant/preferences.cpp
+++ b/radiant/preferences.cpp
@@ -311,7 +311,7 @@ public:
 	LoadGameFile( std::list<CGameDescription*>& games, const char* path ) : mGames( games ), mPath( path ){
 	}
 	void operator()( const char* name ) const {
-		if ( !extension_equal( path_get_extension( name ), "game" ) ) {
+		if ( !path_extension_is( name, "game" ) ) {
 			return;
 		}
 		StringOutputStream strPath( 256 );
diff --git a/radiant/referencecache.cpp b/radiant/referencecache.cpp
index 603745c7..430370c6 100644
--- a/radiant/referencecache.cpp
+++ b/radiant/referencecache.cpp
@@ -115,11 +115,10 @@ bool MapResource_saveFile( const MapFormat& format, scene::Node& root, GraphTrav
 
 bool file_saveBackup( const char* path ){
 	if ( file_writeable( path ) ) {
-		StringOutputStream backup( 256 );
-		backup << StringRange( path, path_get_extension( path ) ) << "bak";
+		const auto backup = StringOutputStream( 256 )( PathExtensionless( path ), ".bak" );
 
-		return ( !file_exists( backup.c_str() ) || file_remove( backup.c_str() ) ) // remove backup
-		       && file_move( path, backup.c_str() ); // rename current to backup
+		return ( !file_exists( backup ) || file_remove( backup ) ) // remove backup
+		       && file_move( path, backup ); // rename current to backup
 	}
 
 	globalErrorStream() << "map path is not writeable: " << makeQuoted( path ) << "\n";
diff --git a/radiant/texwindow.cpp b/radiant/texwindow.cpp
index 51cd8221..2f1144cb 100644
--- a/radiant/texwindow.cpp
+++ b/radiant/texwindow.cpp
@@ -91,7 +91,7 @@ bool string_equal_start( const char* string, StringRange start ){
 typedef std::set<CopiedString> TextureGroups;
 
 void TextureGroups_addWad( TextureGroups& groups, const char* archive ){
-	if ( extension_equal( path_get_extension( archive ), "wad" ) ) {
+	if ( path_extension_is( archive, "wad" ) ) {
 #if 1
 		groups.insert( archive );
 #else
diff --git a/tools/quake3/common/imagelib.cpp b/tools/quake3/common/imagelib.cpp
index 792a55b3..fc257325 100644
--- a/tools/quake3/common/imagelib.cpp
+++ b/tools/quake3/common/imagelib.cpp
@@ -820,9 +820,7 @@ void LoadBMP( const char *filename, byte **pic, byte **palette, int *width, int
    ==============
  */
 void Load256Image( const char *name, byte **pixels, byte **palette, int *width, int *height ){
-	const char *ext = path_get_extension( name );
-
-	if ( striEqual( ext, "lbm" ) ) {
+	if ( path_extension_is( name, "lbm" ) ) {
 		LoadLBM( name, pixels, palette );
 		if ( width ) {
 			*width = bmhd.w;
@@ -831,10 +829,10 @@ void Load256Image( const char *name, byte **pixels, byte **palette, int *width,
 			*height = bmhd.h;
 		}
 	}
-	else if ( striEqual( ext, "pcx" ) ) {
+	else if ( path_extension_is( name, "pcx" ) ) {
 		LoadPCX( name, pixels, palette, width, height );
 	}
-	else if ( striEqual( ext, "bmp" ) ) {
+	else if ( path_extension_is( name, "bmp" ) ) {
 		LoadBMP( name, pixels, palette, width, height );
 	}
 	else{
@@ -852,12 +850,11 @@ void Load256Image( const char *name, byte **pixels, byte **palette, int *width,
  */
 void Save256Image( const char *name, byte *pixels, byte *palette,
                    int width, int height ){
-	const char *ext = path_get_extension( name );
 
-	if ( striEqual( ext, "lbm" ) ) {
+	if ( path_extension_is( name, "lbm" ) ) {
 		WriteLBMfile( name, pixels, width, height, palette );
 	}
-	else if ( striEqual( ext, "pcx" ) ) {
+	else if ( path_extension_is( name, "pcx" ) ) {
 		WritePCXfile( name, pixels, width, height, palette );
 	}
 	else{
@@ -1203,7 +1200,7 @@ void Load32BitImage( const char *name, unsigned **pixels,  int *width, int *heig
 	int i;
 	int v;
 
-	if ( striEqual( path_get_extension( name ), "tga" ) ) {
+	if ( path_extension_is( name, "tga" ) ) {
 		LoadTGA( name, (byte **)pixels, width, height );
 	}
 	else {
diff --git a/tools/quake3/common/vfs.cpp b/tools/quake3/common/vfs.cpp
index de105909..6a6894c2 100644
--- a/tools/quake3/common/vfs.cpp
+++ b/tools/quake3/common/vfs.cpp
@@ -192,12 +192,10 @@ void vfsInitDirectory( const char *path ){
 				if ( path_is_forbidden( name ) )
 					continue;
 
-				const char *ext = path_get_filename_base_end( name );
-
-				if ( striEqual( ext, ".pk3" ) ) {
+				if ( path_extension_is( name, "pk3" ) ) {
 					paks.push_back( StringOutputStream( 256 )( pathCleaned, name ) );
 				}
-				else if ( striEqual( ext, ".pk3dir" ) ) {
+				else if ( path_extension_is( name, "pk3dir" ) ) {
 					g_strDirs.emplace_back( StringOutputStream( 256 )( pathCleaned, name, '/' ) );
 				}
 			}
@@ -235,7 +233,7 @@ std::vector<CopiedString> vfsListShaderFiles( const char *shaderPath ){
 			const char* name;
 			while ( ( name = g_dir_read_name( dir ) ) )
 			{
-				if ( striEqual( path_get_filename_base_end( name ), ".shader" ) ) {
+				if ( path_extension_is( name, "shader" ) ) {
 					insert( name );
 				}
 			}
@@ -246,7 +244,7 @@ std::vector<CopiedString> vfsListShaderFiles( const char *shaderPath ){
 	for ( const VFS_PAKFILE& file : g_pakFiles )
 	{
 		const char *name = file.name.c_str();
-		if ( striEqual( path_get_filename_base_end( name ), ".shader" )
+		if ( path_extension_is( name, "shader" )
 		  && strniEqual( name, shaderPath, path_get_last_separator( name ) - name ) ) {
 			insert( path_get_filename_start( name ) );
 		}
diff --git a/tools/quake3/q3data/polyset.cpp b/tools/quake3/q3data/polyset.cpp
index c03dd8be..469aca1b 100644
--- a/tools/quake3/q3data/polyset.cpp
+++ b/tools/quake3/q3data/polyset.cpp
@@ -84,7 +84,7 @@ polyset_t *Polyset_LoadSets( const char *file, int *numpolysets, int maxTrisPerS
 	//
 	// load the frame
 	//
-	if ( striEqual( path_get_filename_base_end( file ), ".3ds" ) ) {
+	if ( path_extension_is( file, "3ds" ) ) {
 		_3DS_LoadPolysets( file, &psets, numpolysets, g_verbose );
 	}
 	else{
diff --git a/tools/quake3/q3data/q3data.cpp b/tools/quake3/q3data/q3data.cpp
index 39b8f683..684de75f 100644
--- a/tools/quake3/q3data/q3data.cpp
+++ b/tools/quake3/q3data/q3data.cpp
@@ -576,7 +576,7 @@ int main( int argc, char **argv ){
 		}
 		else if ( !strcmp( argv[i], "-dump" ) ) {
 			printf( "Dumping contents of: '%s'\n", argv[i + 1] );
-			if ( striEqual( path_get_filename_base_end( argv[i + 1] ), ".md3" ) ) {
+			if ( path_extension_is( argv[i + 1], "md3" ) ) {
 				MD3_Dump( argv[i + 1] );
 			}
 			else
diff --git a/tools/quake3/q3map2/autopk3.cpp b/tools/quake3/q3map2/autopk3.cpp
index 64cb1db3..da684efa 100644
--- a/tools/quake3/q3map2/autopk3.cpp
+++ b/tools/quake3/q3map2/autopk3.cpp
@@ -788,7 +788,7 @@ int repackBSPMain( Args& args ){
 
 	std::vector<CopiedString> bspList; // absolute bsp paths
 
-	if ( striEqual( path_get_filename_base_end( fileName ), ".bsp" ) ){
+	if ( path_extension_is( fileName, "bsp" ) ){
 		while( !args.empty() ){ // handle multiple bsps input
 			bspList.emplace_back( stream( PathExtensionless( ExpandArg( args.takeFront() ) ), ".bsp" ) );
 		}
diff --git a/tools/quake3/q3map2/bsp.cpp b/tools/quake3/q3map2/bsp.cpp
index 37357e96..0936a1dd 100644
--- a/tools/quake3/q3map2/bsp.cpp
+++ b/tools/quake3/q3map2/bsp.cpp
@@ -885,10 +885,10 @@ int BSPMain( Args& args ){
 
 	/* expand mapname */
 	strcpy( name, ExpandArg( fileName ) );
-	if ( !striEqual( path_get_filename_base_end( name ), ".reg" ) ) { /* not .reg */
+	if ( !path_extension_is( name, "reg" ) ) { /* not .reg */
 		/* if we are doing a full map, delete the last saved region map */
 		remove( StringOutputStream( 256 )( source, ".reg" ) );
-		if ( !onlyents || !striEqual( path_get_filename_base_end( name ), ".ent" ) ) {
+		if ( !onlyents || !path_extension_is( name, "ent" ) ) {
 			path_set_extension( name, ".map" );   /* .reg and .ent are ok too */
 		}
 	}
diff --git a/tools/quake3/q3map2/convert_bsp.cpp b/tools/quake3/q3map2/convert_bsp.cpp
index 10fbf8c1..c81a49e0 100644
--- a/tools/quake3/q3map2/convert_bsp.cpp
+++ b/tools/quake3/q3map2/convert_bsp.cpp
@@ -879,7 +879,7 @@ int ConvertBSPMain( Args& args ){
 		force_bsp = true;
 	}
 
-	if ( force_map || ( !force_bsp && striEqual( path_get_extension( source ), "map" ) && map_allowed ) ) {
+	if ( force_map || ( !force_bsp && path_extension_is( source, "map" ) && map_allowed ) ) {
 		if ( !map_allowed ) {
 			Sys_Warning( "the requested conversion should not be done from .map files. Compile a .bsp first.\n" );
 		}
diff --git a/tools/quake3/q3map2/light.cpp b/tools/quake3/q3map2/light.cpp
index 39ada471..004ad443 100644
--- a/tools/quake3/q3map2/light.cpp
+++ b/tools/quake3/q3map2/light.cpp
@@ -2677,7 +2677,7 @@ int LightMain( Args& args ){
 	path_set_extension( source, ".bsp" );
 
 	strcpy( name, ExpandArg( fileName ) );
-	if ( !striEqual( path_get_filename_base_end( name ), ".reg" ) ) { /* not .reg */
+	if ( !path_extension_is( name, "reg" ) ) { /* not .reg */
 		path_set_extension( name, ".map" );
 	}
 
diff --git a/tools/quake3/q3map2/map.cpp b/tools/quake3/q3map2/map.cpp
index 5198d236..9a04619f 100644
--- a/tools/quake3/q3map2/map.cpp
+++ b/tools/quake3/q3map2/map.cpp
@@ -1381,7 +1381,7 @@ void LoadEntityIndexMap( entity_t *e ){
 	Sys_FPrintf( SYS_VRB, "Entity %d (%s) has shader index map \"%s\"\n",  mapEnt->mapEntityNum, e->classname(), indexMapFilename );
 
 	/* handle tga image */
-	if ( striEqual( path_get_extension( indexMapFilename ), "tga" ) ) {
+	if ( path_extension_is( indexMapFilename, "tga" ) ) {
 		/* load it */
 		Load32BitImage( indexMapFilename, &pixels32, &w, &h );
 
diff --git a/tools/quake3/q3map2/shaders.cpp b/tools/quake3/q3map2/shaders.cpp
index 4bd4d180..d53f54a5 100644
--- a/tools/quake3/q3map2/shaders.cpp
+++ b/tools/quake3/q3map2/shaders.cpp
@@ -2012,7 +2012,7 @@ void LoadShaderInfo( void ){
 				return false;
 			};
 
-			if( !striEqual( path_get_extension( token ), "shader" ) )
+			if( !path_extension_is( token , "shader" ) )
 				strcatQ( token, ".shader", sizeof( token ) );
 			/* new shader file */
 			if ( !contains( token ) ) {