“The game still says ‘DX12 not supported’”
This does NOT give you hardware acceleration. Performance will be extremely slow (1-5 FPS in 3D games). dxcpl directx 12 emulator
You can manually cap or spoof the DirectX version (e.g., setting it to 11_1) to satisfy a game's launch requirements. The Reality of "DirectX 12 Emulation" “The game still says ‘DX12 not supported’” This
VKD3D-Proton (used by Steam Deck) is the closest thing to a “DX12 emulator.” It translates commands in real-time to Vulkan, allowing DX12 games to run on older GPUs that have at least Vulkan 1.2 support. dxcpl directx 12 emulator