#20 PROTON_USE_WINED3D11 env variable VariablePROTON_USE_WINED3D11 Value1, 0 ExamplePROTON_USE_WINED3D11=1 %command% It forces Proton to use Wine's D3D11 graphical backend instead of the default DXVK/VKD3D. Specifically, it instructs Wine to translate DirectX calls into OpenGL instead of Vulkan. Cites: