Fans_Fun I am twice as useless as not only do I use Win10, I also have no idea how the win10fix script actually works. Maybe someone with Win11 can help you. Personally, though, I would check the AAU Github issues to see whether anybody ever asked about Win11 compatibility, and if not, go to AAU Discord and ask the people there about said compatibility AND whether win10fix does anything at all for Win11 systems, just to know for sure.
Since you cannot run the game with the fix enabled, I lean heavily on the assumption that atrocious (talking about down-to-single-digits, not oh-no-I-lost-5-FPS) framerate is a result of that: you need that fix.
The only thing I could probably suggest testing is: one, if you have things like Software Vortex Processing enabled in the
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- disable it, see what difference that makes (if any; the on-hover tip itself says "drops FPS", after all); and two, go to win10fix settings and test all three d3d9 variants. Maybe the game launches with one of those. If not - disable win10fix and enable wined3d instead. Seeing how you have an NVIDIA card, I would try wined3d option first - the AA2 wiki seems to indicate there are some issues with NVIDIA GPUs (or, considering how long ago the FAQ there was written, possibly "there WERE issues, not anymore").