OK, I think I've got the file format/structures sorted, but I am puzzled as to the raison d'etre for the /var/playlists file. As Pim says, it seems to be a concatenation of actual playlist (0) fids, but why? What is its purpose? There's no delimiter separating each playlist's group of fids from the next group, so what exactly is it for?

Anyone enlighten me on this?

Oh, one more technical question on this. Does /var/playlists contain ALL the playlists (as Pim suggested) or just the top level (as I think Roger indicated) or some other combination?

Thanks.