Not sure about the per-game config, but the Proton is definitely open source [0], as are DXVK [1] and D9VK [2].

Steam Play is part of the Steam client, so is proprietary. ProtonDB isn't open source but does data dumps to github regularly [3].

[0] https://github.com/ValveSoftware/Proton/

[1] https://github.com/doitsujin/dxvk

[2] https://github.com/Joshua-Ashton/d9vk

[3] https://github.com/bdefore/protondb-data

Thanks!

I guess it somehow makes sense for Valve to keep the per-game tweaks private. With all of that money they're printing though, I sure wish they could feel that they could afford to be less defensive.

None of it is private. The per-game settings are all listed here, the options are all implemented in Proton, which is completely open source: https://steamdb.info/app/891390/info/

That's very nice.

I think this will make game preservation easier in the near future.

If it helps, Lutris has config for most games that are open source and available.

https://lutris.net/