Board Thread:M.U.G.E.N Help/@comment-10948389-20160306011407/@comment-25517076-20160309024518

If by see it bigger you mean make it fullscreen, then that is also in Mugen.cfg. If you mean increasing its proportions beyond 640x480, then I do not recommend that. I tried it and my fps on Mugen suffered dramatically. I know sizes outside the recommended ones also make any screenpack look dramatically out of proportion.

And yes, that is the right one. If you feel like you're going to screw up a few times, back up Mugen, just in case.

You'd have to mark down every folder path.. so it'd probably look something like

data/EVE BATTLE/EvE/system.def

For you it might be different though. In short, just mark down each folder in Mugen.cfg as you dig your way to the system.def you're planning to use.