Probably not in this case. The skipping behaviour (and even, at least once it's happened to someone once, the infinite-loop avoidance) are so obvious that there wouldn't have been a requirements document that said "Implement playlists in such a way that the player skips unplayable tracks" -- it would just have said "Implement playlists". Unfortunately for old_empeg, the only "document" that could prove we had this functionality by September 2000, would be the 2000-era firmware release itself.

Peter