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Windows 7, 8 and 8.1 support will end tomorrow (January 1st 2024)
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Issue tracker for Linux version of Steam
While understandable I hope Steam does keep working on these platform's for some titles which might only run on older systems.
What titles only run on x86 and not x86_64?
Some obscure title will surely have weird driver, hardware and OS quirks. For example Crazy Machines 2's physics break down and the fixes didn't work for me. They use PhysX for their physics engine, before Nvidia acquired it, and it was heavily updated of course and now the puzzles don't work anymore. Maybe somebody found another solution to it by now, but I haven't checked it.
Child of light, a Ubisoft game, I couldn't get working on windows 10. Forums say it hasn't been patched since vista... Even if I copy the files over locally I don't think I'll have much luck getting uplay to run. Thanks DRM.