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This is from the Steam hardware survey. Steam doesn't run under Wine generally so this problem shouldn't come up

Proton is a modified version of Wine. If the underlying game is sending a bug/crash report, it may "see" itself as running under windows as that is what wine presents.

https://github.com/valvesoftware/proton

"Proton is a tool for use with the Steam client which allows games which are exclusive to Windows to run on the Linux operating system. It uses Wine to facilitate this."

True but irrelevant, these numbers are reported by Steam which is running natively on Linux.

It launches proton, it is not itself running on proton.

Correct. Steam, a native Linux app, will run Windows games via Proton. As Steam itself, which is collecting the data in TFA, is a Linux app, it shouldn't be affected by thinking it's running under Wine/Proton. As to your original question, I don't think many developers release information on what OSes their players are using, so I don't think we can tell

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