Valve's Steam Deck and SteamOS primarily support Windows games compatible with the Proton compatibility layer and some native Linux titles. Microsoft and Asus have collaborated on the ROG Xbox Ally, which features a new Xbox-branded interface designed to improve compatibility for PC gamers while resembling SteamOS. This interface will debut on the ROG Xbox Ally and is planned for broader release on other handheld devices next year. Microsoft has been developing a handheld-optimized user interface for Windows since at least 2022, identified during an internal hackathon. The proposed "Windows Handheld Mode" includes a tile-based UI similar to the Xbox interface and aims to enhance touch screen usability. The ROG Xbox Ally's full-screen interface replaces the traditional Windows desktop, conserving RAM and optimizing energy consumption compared to standard Windows devices like the regular ROG Ally, which require additional software to function similarly to SteamOS.