https://www.pcgamer.com/steam-play-update-opens-up-more-games-to-linux-users/

Linux users will now be able to play more Windows games on Steam thanks to a new beta version of Steam Play released yesterday.

For the new beta, Valve has helped design and fund a new modified distribution of Wine, an existing open-source compatibility project. The modified version is called Proton, and it will mean that Windows games with no current Linux version can be installed and played through the Linux Steam client, "complete with native Steamworks and OpenVR support".