Collecting Fighting Games, mostly ARC System Works related, or if something better comes along. Also RPGs, Visual Novels, a few certain kinds of Action Games, and Game Design/Art.
If they are just .MUA files (I would assume) they should be readable just like any stages. However, I haven't fully deciphered the .MUA file completely - just enough to extract geometry from it right now. I haven't gotten to animation at all.