Not just Proton: Getting to know Valve's new SteamOS compatibility layers

Since the release of the Steam Deck , Valve fans have gotten very familiar with the idea of the Proton compatibility layer that allows games written for Windows to run capably on the Linux-based SteamOS (though Valve's efforts in this realm date back farther than that ). To get more games running on the SteamOS-powered Steam Frame , though, Valve is relying on two additional compatibility layers that are new to the Steam architecture . The first, FEX, is Valve's port of fex-emu , an open source