So, like in the Windows 10 article, I tried downloading win mugen on windows 10, and it crashed. I tried looking around more. I found an app called "Win Mugen 1.0". I clicked the link and downloaded the game. I got a zip folder called "Win Mugen mod for mugen 1.0". I copied it to my Actual Games folder. I started up the game. Everything looked just like Mugen 1.0. I downloaded a Mario character. Everything was just normal, but as I was fighting, Carlos.avi/Gajardo.avi appeared. I was freaked out. This is a modded mugen, so stay away from it!
An image of Win Mugen 1.0: