Valve has been supporting Fex, an open-source initiative for enabling Windows games to run on ARM architecture, for nearly ten years. The Fex compatibility layer was developed to ensure reliability for gamers. Valve aims to expand PC gaming options by allowing Windows games to operate on ARM devices, which could include low-power laptops, tablets, and smartphones. The company is developing an ARM version of SteamOS that will maintain the same core components as its x86 version, with a tailored version of Proton that includes the Fex emulator. While there are challenges with compatibility, particularly with modern multiplayer titles and anti-cheat mechanisms, Valve is working to address these issues. The demand for alternatives to Windows in the gaming market is increasing, particularly with the success of SteamOS on the Steam Deck.