Request: Playlist export to offer different extensions.

Request: In the Export dialog a default plylist extension is appended to the given file name.
Request: A combo box provides a choice of play list extensions. Choose one to automatically append it to the given name text.
Use Case: When saving a playlist, if you do not know any extensions for any playlist type it is not possible to save a new playlist.
Cheers, keep up the good work.
Ian