Valve adds FEX and other layers to run x86 games on Arm-based Steam Frame

Alongside Proton, Valve is deploying additional compatibility layers to make Windows games playable on the Arm-based Steam Frame headset running SteamOS. Chief among these is FEX, an open-source x86-to-Arm binary recompiler that Valve has funded since 2018, well before the Steam Frame's existence, working with lead developer Ryan Houdek to make it robust enough for production use.