No there is a definite format to that - it actually mirrors the folder structure of the mp3 files that I have placed on the XT - so providing from your media player you can create a list that contains a folder, an album and a song, you could make a playlist on your computer and see how the text file has to change in order to match up with the Zumos format.#EXTM3U
#EXTINF: -1, The Boys of Summer.mp3
3:/MP3/Don Henley/The Boys of Summer.mp3
#EXTINF: -1, Viva La Vida.mp3
3:/MP3/ColdPlay/Viva La Vida.mp3
#EXTINF: -1, Someone I Knew.mp3
3:/MP3/Gordon Haskell/Harrys Bar/Someone I Knew.mp3
#EXTINF: -1, The End
3:/MP3/The Beatles/Abbey Road/The End.mp3
#EXTINF: -1, Hallelujah
3:/MP3/Various Artists/Acoustic Love/Hallelujah.mp3
#EXTINF: -1, Sultans of Swing
3:/MP3/Dire Straits/Alchemy- Dire Straits Live Disc 1/Sultans of Swing.mp3
THe MP3 player on the XT does not take any notice of the folder structure - it uses the tags within the MP3 file for its information and sorting - so providing the mp3 files are the same name and the titles are the same - you could reconstruct this however you wanted.
I guess the EXTINF is a flag to indicate what the title of the song is.
The 3:/MP3 etc is where the mp3 file is located to play that song.
At present my Windows Media player cannot create a playlist.
But thinking about it - I could create a spreadsheet that allowed you to build up play lists of this format quite quickly from the information that is in you MP3 folder on your Zumo.
I'll see if the idea works. Do you have Excel ?