Which is, in that case, Windows 10 in a Wine bottle.
Steam.app can’t run Windows games directly on macOS, like it does on Linux with Proton. So you have to install the Windows version of Steam in a Wine bottle to be able to install and run Windows games from Steam on macOS
Yes, my country is EU. My State is France.
I’m European before being French and I don’t care if it confuses people.