Download this file and put it in your nvram dir of demul . WHat is it? Well these nvram files hold the arcade information. So example here we have MVC2 and the files unlocks everything like all characters and extra stages. Something in arcades that would take months to do on your own. SO download this to get the full benefit of the games you play!
This file contains multimple nvram files for most of the demul games including the latest ones like 18 wheeler etc.. enjoy