you have to put the file in the game you have to download the file of super mario 64 (USA) .z64 after when you have downloaded this file you have to put in the game after
i tried that but the app refused to open with no explanation and then i did some research and i saw a github post of someone with the same problem and a dev was like lol my bad the code will only work with a new mac os version while i cant do that because my mac is from 2015.