User blog comment:PlasmoidThunder/Cheapie War No More/@comment-3064592-20151224093559/@comment-5289928-20151224222843

I think there's a slightly excessive level of paranoia going on here.

If you're using anywhere near a modern version of Windows (Vista or above at default settings) and Mugen 1.0 then there's no reason code executed in MUGEN should be able to do anything to your system because Window is far more restrictive in what data programs can modify that they shouldn't have any place doing, and 1.0 fixes a lot of the exploitable issues WinMUGEN has.