Pokémon, Zelda, Final Fantasy I-VI, Fire Emblem, Earthbound, PvZ, Elder Scrolls, Fallout, etc. (ask me)
Also a writer of crappy fanfiction. (Don't check it out.)
It's not meant for .sav files, it's for the rom, for the uncompressed bin file. It's been a while since I hacked FE12 though, so I forgot the name of the particular file.