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I have been trying to debug startup issues that Orbiter been having and improved error reporting and checking. It's known that some Intel graphics chips such as Xe Graphics and Arc no longer support D3D9. There is a new graphics client added "D3D9ON12Client" which runs D3D9 through DX12 wrapper. There's also been problems that D3D9 is stuck on iGPU and doesn't run via high performance GPU. For some unknown reason DirectX 9 applications are no longer allowed to access high performance GPU on some computers. It's currently unknown if this limitation applies to DX12 wrapper as well. I can't test it because I don't have a computer with dual graphics. So, if you have a proper setup then could you test the D3D9ON12Client how it responses to GPU selection and post the Orbiter.log
I have attached a pre-build binaries for testing with Open Orbiter.
I have attached a pre-build binaries for testing with Open Orbiter.