playlist relative path format?

Okay…this is weird.  I changed it from MSC to MTP, reripped all of my music and reloaded it.  The default playlists that JRiver transferred over worked.  JRiver made the playlists .m3u files when it was in MSC mode, but when it’s in MTP mode, it made PLA playlists on the fuze instead. 

MTP is slower, but everything synchs and works the way it’s supposed to.  I couldn’t get playlists to work in MSC for the life of me.  It shouldn’t matter.