Compatibility īeing a fork of Wine, Proton maintains very similar compatibility with Windows applications as its upstream counterpart. A separate library known as D9VK handled Direct3D 9 support until it was merged into DXVK in December 2019. These include Direct3D-to- Vulkan translation layers, namely DXVK for Direct3D 9, 10 and 11, and VKD3D-Proton for Direct3D 12. Proton incorporates several libraries that improve 3D performance. These include Doom (2016), Quake, and Final Fantasy VI. Upon release, Valve announced a whitelist of 27 games that were tested and certified to perform like their native Windows counterparts without requiring end-user tweaking. Proton was initially released on 21 August 2018. It is officially distributed through the client, although third party forks can be manually installed. Proton is designed for integration into the Steam client as 'Steam Play'. It is a collection of software and libraries combined with a patched version of Wine to improve performance and compatibility with Windows games. Proton is developed by Valve in cooperation with developers from CodeWeavers.

Proton is a compatibility layer for Windows games to run on Linux-based operating systems. DXVK (and D9VK in older versions): zlib.

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