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I tried looking at the Launch Options, but it tells me it's for Advanced Users Only and gives me a box to write something in? It's not a password box.

Halfway through writing this I looked up if that's what the launch options window was supposed to do and it... is, I think. I found out how to tell it to launch in windowed mode rather than fullscreen, and while the games in question still launch in fullscreen, they actually work now.

I think that's it, then. Thanks for the help, guys.