Sonic generations has stopped working

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Sonic Generations in particular says three.

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However, games with the pop up that says 'Installing DirectX' as they boot in Steam don't work - they start to boot and then stop immediately. Overwatch, RollerCoaster Tycoon 2, and Portal 2 all run perfectly fine - heck, Portal runs better than it did in Mac mode.

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I'm running an Early 2015 MacBook Air with Intel HD Graphics 6000 and an Intel i5 processor with 8GB of RAM with Windows 10 64-bit through a Boot Camped external drive.