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What DLLs? Wine has DLLs but they're compiled from open source, unless you are downloading some installer with winetricks. What did Proton do?

If proton is open source, you would not need it, wine/vkd3d would be enough. I have a build of git wine/vkd3d, hardly anything works.

If wrong, why valve is not using directly wine/vkd3d and/or not backporting anything?