Proton Experimental has been updated to include the following additional fixes:
Now playable: VIDEO GAME (Steam Link).
Included initial work on speech synthesis - requires manual installation of Proton Voice Files (steam://install/3086180), confirmed to work with Infinite Stars - The Visual Novel.
Fixed Star Wars Outlaws not being playable on some setups
Fixed Hell Let Loose crashing when joining a server after a recent game update and plays audio again when showing developer logos.
Fixed Rivals of Aether II crashing with Intel GPUs.
Fixed fullscreen mode in The Bright Star Of Seraph-Katis.
Improved video playback in Max: The Curse of Brotherhood.
Fixed Dread X Collection 3 Bete Grise minigame.
Fixed Proton Experimental regressions:
Progressbar95 no longer has crackling audio when using mouse.
Sakuna: Of Rice and Ruin no longer requries constant mouse movement to progress.
Fixed Ghostbusters: The Video Game Remastered crashing when playing some of the HD bonus videos.
Fixed CPU topology override issues on machines with more than 32 logical cores.
Added support for game mods that load via custom dinput8.dll.
Fixed Space Engineers not registering trigger input with controllers.