> rewrite d3d9.dll to emulate the API in user mode on top of D3D12. There seem to be such a project actually, just released to open source: https://github.com

> rewrite d3d9.dll to emulate the API in user mode on top of D3D12. There seem to be such a project actually, just released to open source: https://github.com/microsoft/D3D9On12 https://github.com/microsoft/D3D9On12 https://devblogs.microsoft.com/directx/open-sourcing-direct3d-9-on-12-and-the-release-of-the-dxbc-signer-nuget-package/ https://devblogs.microsoft.com/directx/open-sourcing-direct3... But it seems you have to actively enable it in the development time, the OS won't just silently do this on itself and I doubt Microsoft or anybody else is going to update their software to do so.