Source review: October 11, 2026. Read current project documentation before changing tools or system software.
Understand the software layers
SteamOS can run native Linux games, while Proton provides a compatibility environment for many Windows games. Proton is not a promise that every Windows application works, and it does not turn the Deck into a Windows installation. Valve’s compatibility review covers more than simply reaching a title screen, including controller access, readable interface elements and other usability requirements. Read a game’s current compatibility details and developer notices before spending time on a workaround, particularly when an online service or launcher controls whether it can run.
Establish one reproducible failure
Record the game build, SteamOS version, selected Proton version, launch arguments and whether third-party mods are installed. Try a clean launch with the game’s default configuration and verified game files. Note exactly when it fails: before the launcher, after login, during shader compilation, at a menu or after loading a save. These stages point toward different causes. Keep the same test sequence and location across attempts so a later improvement is measurable rather than a impression based on a different scene.
Change compatibility tools carefully
Steam offers per-title compatibility selection, and Valve maintains Proton’s source and issue tracker. If a project or developer recommends another version for the exact problem, change that one setting and retest. Keep a note of the previous choice so you can return to it. A newer or experimental build is not automatically best for every title. Do not combine a Proton change, launch-option change and game mod update in one experiment because you will lose the ability to identify which change produced the result.
Protect the compatibility environment and saves
A Windows game running through Proton may keep local data in its compatibility environment rather than an obvious game-install directory. Before deleting that environment as a troubleshooting step, identify and back up saves or other important data using the game’s documented paths. Cloud synchronization is game-specific and can also synchronize an unwanted change. If logs are needed, the Proton repository documents logging options; read the resulting file before posting it because paths, account names and other personal details can appear. Keep a private original copy for comparison.
Respect service and performance boundaries
Some failures depend on game anti-cheat, account services or developer configuration rather than a missing Linux library. Consult the developer’s current support statement and do not treat an unrelated community success report as permission to alter online protections. For performance issues, test ordinary graphics settings and frame pacing before blaming Proton or the hardware. A useful bug report names the exact versions, gives short reproduction steps and includes the relevant log. Avoid claiming universal compatibility from one brief test, especially after a game or launcher update.
Sources and project documentation
Continue with the related guide or the Steam Deck directory.