Currently Medialibrary /Edit creates playlists stored in the the first folder used for a track added to the playlist. This means playlists are stored in mutiple locations. This tips describes how to have all playlists in one folder...linked to Favourites.
Firstly create the central folder you want to store the playlists in. Now download Playlist Creator found here:-http://www.oddgravity.de/
Open Playlist Creator...and open you current playlists one by one. Make sure the output is set to Relative, not absolute. Each time..change the Save Folder from the folder the playlist was created in, to the single central folder you created earlier. Select Create Playlist...and a new playlist is created, stored in the central folder..but pointing to the origonal files. The files themselves are not moved.
Make that central folder a Favourite..and all your playlists can be found in one location. Music Jukebox
As well as it's own QPL system, Music Jukebox will support externally created m3u playlists in a similer manner to above. But these playlists have to be created with Extended Information disabled in Creator. The scanned folder should be selected as the Save Folder. They will not be scanned..they will appear when Playlist is selected in Music Jukebox. Users relocating pls just convert during this process.