Thanks for the help guys...I think i'll stick with trying to shrink my Mame sets properly (Matrimelee, Metal Slug 4, etc) and avoid the newer rom sets till they reach some kind of standard...think I've downloaded 3gigs of files that rom center just tells me are bad, unknown, and missing files. hard to shrink a set if you can't get a proper parent set after all. i have no idea how you guys got your sets sorted once they fell off the newsgroups. Will this program help me get the correct s1 for Matrimelee?