Valve launched the latest upgrade to Proton Experimental, their staging ground for all the latest fixes for Windows games on Linux / SteamOS.

What is Proton Experimental? It’s like a staging ground for faster updates to their Windows -> Linux compatibility layer for gaming. There’s a bit less testing, and sometimes there’s breakages. But eventually after a while all the updates get rolled out to a numbered Proton version like the latest stable version being Proton 10.0-4. See more about all the Proton versions in the GamingOnLinux guide.

For the April 10th Proton Experimental update they noted newly playable titles include:

Resident Evil (1996).
Resident Evil 2 (1998).
Dino Crisis.
Dino Crisis 2.
Universe Generator: The Golden Sword.