You can see how the notification functions I used here just display the names, and use the nLevel value to indent the sub-folders and files.

My search (coming soon) uses the same method with different functions that actually index the content in the files.

Folder "WalkFolders":

      test.asp
      test2.asp
      test3.asp

      Folder "Empty":

      Folder "LastOne":

            Folder "(Almost)":

                  test.asp

      Folder "SubFolder1":

            test.asp
            test2.asp