Steve
Exployer plays the AOP3 files directly using Media Player. Renaming a mp3 file into AOP3 and giving it the same 8 letter/number file name as an existing file allows to be played on the player. The playlist file is simply a listing of the AOPŁ files in the playlist eg
PLP PLAYLIST
VERSION 1.20
HDD, AIWA_AOP\MUSIC\e42a0095.AOP3
HDD, AIWA_AOP\MUSIC\b9f925cd.AOP3
HDD, AIWA_AOP\MUSIC\b48f8354.AOP3
HDD, AIWA_AOP\MUSIC\e1adea48.AOP3
HDD, AIWA_AOP\MUSIC\fc7197f4.AOP3
HDD, AIWA_AOP\MUSIC\b5a45ac4.AOP3
HDD, AIWA_AOP\MUSIC\e2448df8.AOP3
HDD, AIWA_AOP\MUSIC\3d6cf0d3.AOP3
HDD, AIWA_AOP\MUSIC\9f468638.AOP3
HDD, AIWA_AOP\MUSIC\23b127ba.AOP3
Although the playlist is not a manditory thing it appears that is there isn't an entry in a playlist a track won't play and certainly doesn't appear in either the playlists or track listings.
Hope this helps
Ian