MediaPlayerClassic: playlists in "favorites"

[Radiohead-fan]

By editing the registry (RegEdit), I have found where MPC stores the filenames for its "favorites" list. I edited these to reflect the names of playlist files instead. It works Great! Now what I really wanted to do was to be able to have sub-folders (to sort playlists by Artist, whatever...). I tried adding keys etc, in the registry but without much knowledge or any success. Anyone know of a way to do this?

[fastplayer]

If there's no option in MPC, then there's no way to make it work through the registry.