I can run over all the lvl files and make a list of every "type" there is Anim in cam files too, but if you removed it the game will crash, these are the extra bits I was talking about many posts ago.
The FG1 must also be tiles, square sections of bitmaps that are "pasted" over the top of the cam images, that means that they much also contain x,y coord info for each tile.
Maybe they can have various width/height but I doubt it.
In related news I might have a sprite ripper for type 4 AE sprites in a few days
(the gamespeak uses these type of sprites at least..)