FileSystemObjectSelector.cs

        public static List<string> SelectFolders(IHostWindow hostWindow, SelectFolderOptions options)
	    {
	        Arguments.RequireNotNull(hostWindow, nameof(hostWindow));
	        Arguments.RequireNotNull(options, nameof(options));
	        Arguments.RequireNotNullOrEmpty(options.Title, nameof(options.Title));

	        var dlg = new CommonOpenFileDialog
	        {
	            EnsureReadOnly = options.EnsureReadOnly,
	            IsFolderPicker = true,
	            AllowNonFileSystemItems = false,
	            Title = options.Title,
	            AddToMostRecentlyUsedList = options.AddToMostRecentlyUsedList,
	            EnsurePathExists = options.EnsurePathExists,
                Multiselect = true
	        };

	        if (options.InitialFolder.NotNullOrEmpty())
	        {
	            dlg.InitialDirectory = options.InitialFolder;
	        }

	        if (dlg.ShowDialog(hostWindow.Handle) != CommonFileDialogResult.Ok)
	        {
	            return null;
	        }

	        try
	        {
	            var selectedFiles = dlg.FilesAsShellObject.Select(s => s.ParsingName).ToList();
	            return selectedFiles;
	        }
	        catch
	        {
	            hostWindow.ShowErrorMessage("Could not create a ShellObject from the selected item");
	        }

	        return null;
	    }