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Proton Experimental received an update on September 21, 2026, addressing Windows game compatibility across SteamOS and desktop Linux. The release also updates Wine Mono to 11.3.0 and Xalia to 0.5.0, with both components gaining ARM64 builds.
Game and launcher fixes
The update makes Ragnarok: The New World playable beyond Steam Deck and restores Deus Ex: Mankind Divided on AMD GPUs after a Proton 11 regression. Other targeted fixes cover Japanese kana input in Winning Post 9, video playback in Making Lovers and the Safe Mode dialog in Call of Duty: Modern Warfare 2 (2009).
EA App users running Gamescope should now find that the launcher's login window receives focus correctly. Proton also changes how Xalia interacts with several configuration tools and launchers, including Fallout: New Vegas and Final Fantasy XI, where Xalia has been disabled for the gamepad configuration window to avoid conflicting with native controller support.
ARM64 compatibility expands
Wine Mono 11.3.0 introduces an ARM64 build based on a new Mono port for ARM64 Windows, while some supporting components use arm64ec. The release also fixes a path-handling regression and a premature end-of-stream issue affecting legacy VB6-compatible line reading. Its bundled dependencies move to llvm-mingw 20260616, SDL 3.4.14 and FNA 26.08.
Xalia 0.5.0 likewise adds an ARM64 build. These additions are relevant to ARM64 Linux gaming devices such as Steam Frame, although the source does not provide broader game compatibility results or performance measurements for that hardware.
Controller navigation changes
Xalia's update adds Win32 scrollbar support, improves its recognition of WinForms containers and adjusts controller handling for combo boxes. Pressing the A button now generates an Enter keypress, resolving selection problems reported in HITMAN World of Assassination. It also stops an unnecessary main-loop polling behavior that consumed CPU and adds application-specific handling for several games, installers and configuration utilities.
Because Proton Experimental is the testing branch for changes that may later reach numbered Proton releases, these fixes are available in an explicitly experimental channel rather than presented as part of a new stable Proton version.
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