Valve Software has released a new version of their Wine based compatibility tool for Steam Play

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.

Most users will prefer to use Proton provided by the Steam client itself. The source code is provided to enable advanced users the ability to alter Proton. For example, some users may wish to use a different version of Wine with a particular title.

Proton now includes wine-mono. Enables many XNA games, Unreal Engine 3 games, game launchers, and more.
The launcher and updater for Warframe is now functional.
Fix text input in Age of Empires II HD.
NARUTO SHIPPUDEN: Ultimate Ninja STORM 4 is now playable.
Evochron Mercenary is now playable.
Continue maintaining Uplay functionality.
Update DXVK to 1.0.3.
Update FAudio to 19.04-13-ge8c0855.

  Proton 4.2-3 released