Valve has released a new Proton Experimental update with fixes for several Windows games running through Linux and Steam Deck.
The September 25 update restores support for CEG protected games after a recent regression, fixes Japanese text rendering in Killer7, and resolves compatibility problems affecting Crysis and Crysis Wars on some newer AMD processors.
The update also adds early support for 32 bit OpenXR, expanding Proton's compatibility work beyond traditional desktop games.
| Fix or feature | What changed |
|---|---|
| CEG protected games | Regression that made them unplayable has been fixed |
| Crysis | Fixed on some newer AMD CPUs |
| Crysis Wars | Fixed on some newer AMD CPUs |
| Return to Krondor | Rendering corruption fixed |
| Killer7 | Japanese text rendering fixed |
| Hide and Moo! | Exit error fixed |
| 32 bit OpenXR | Early support added |
Killer7 gets a Japanese text rendering fix
One of the most visible changes affects Killer7.
The update fixes a problem that caused Japanese text to render incorrectly while running through Proton Experimental.
Text rendering issues can make games difficult or impossible to play in certain languages, so this change should improve the experience for players using the Japanese version.
The fix is part of a wider set of compatibility changes included in the latest Experimental build.
Crysis and Crysis Wars work better on newer AMD processors
The update also targets Crysis and Crysis Wars.
Both games could fail to run correctly on some newer AMD CPUs that support CPUID faulting.
Proton Experimental now includes a fix for that compatibility problem.
The changelog does not list specific Ryzen processors or AMD CPU generations, so the exact range of affected hardware is not stated.
If you encountered launch or compatibility problems with either game on a newer AMD system, the latest Experimental version may resolve them.
CEG protected games are playable again
Valve has also fixed a Proton Experimental regression affecting games protected by CEG.
The issue made those titles unplayable after an earlier Experimental update.
The new release reverses that regression and restores compatibility.
The supplied changelog does not name individual affected games, so it is not clear which titles were impacted most heavily.
Return to Krondor rendering corruption is fixed
Another game specific correction addresses Return to Krondor.
The latest Proton Experimental build fixes rendering corruption in the game.
No additional details are given about the exact visual problems or which graphics hardware was affected.
The fix is included automatically as part of the new Experimental update.
Hide and Moo! gets an exit error fix
Hide and Moo! also receives a small compatibility improvement.
Previously, the game could show an error when quitting.
The new update fixes that behavior.
Although it is a minor issue compared with games failing to launch, it is another example of Proton Experimental's ongoing game specific compatibility work.
Early 32 bit OpenXR support arrives
The most technical addition in this update is early support for 32 bit OpenXR.
This feature requires the environment option PROTON_USE_WOW64=1 on x86 systems.
Because the support is described as early, it should be treated as a work in progress rather than complete compatibility.
The addition could still be useful for testing older or 32 bit applications that rely on OpenXR.
The update should install automatically
If Proton Experimental is already installed, the new version should download automatically through Steam.
If it is not installed, you can search for Proton Experimental in the Steam Store and add it to your Steam Deck or Linux system.
As usual, Proton Experimental is intended for newer compatibility fixes and features before they move into more stable Proton releases.
This update is relatively focused, but it brings useful fixes for Killer7, Crysis, Crysis Wars, Return to Krondor, Hide and Moo!, and CEG protected games while also beginning support for 32 bit OpenXR.
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