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Once you create the shortcut, access its properties. In its tabs there sould be a section with type, path, and destination

After the double quotes in the destination tab just put /MIS1

the closest i get with this is target type, location & just target. and i put that at the end of the exe stuff and it says it's not a valid path

Hello, it should be "Target" for you, so you should make its path into "...blablabla\sonic3d2d 1.24.exe" /MIS1. The additional commands should stay out of the quote and separated by one space.