The last time I tried to run Tachyon: The Fringe was Windows 10, and it failed. IIRC I could launch it and play, but there was a non-zero chance that a FMV cutscene would cause it to freeze.

I see there are guides on Steam forums on how to get it to run under Windows 11 [0], and they are quite involved for someone not overly familiar with computers outside of gaming.

0: https://steamcommunity.com/sharedfiles/filedetails/?id=29344...