What is forza-horizon-6-rx-580-fh201-fh205-fix?

This repository is an experimental fix for players with AMD RX 580, Polaris, graphics cards who get error codes FH201 or FH205 when trying to launch Forza Horizon 6. These errors appear because the game requires a DirectX 12 feature called Enhanced Barriers and a specific graphics capability level, Feature Level 12_1, that older drivers or the standard AMD driver package do not properly report as supported. The fix works by providing a custom replacement for the system's d3d12.dll file, the core DirectX 12 library. This replacement is a proxy DLL, it sits between the game and your GPU driver, intercepts certain DirectX calls, and tells the game that the required capabilities are present. You install it by copying this single file into the game's main folder alongside the game executable. To uninstall, you delete the file and the game returns to using the standard DirectX library. If the FH205 error persists after installing the fix, it means the AMD driver itself has not enabled Enhanced Barriers support, and you need to install the AMD Agility SDK or Work Graphs driver package. A diagnostic tool, D3D12Caps.exe, is included to verify whether the driver has activated the needed support. The fix creates a log file in the game folder so you can confirm it loaded correctly. The source code is C++ and compiles with Visual Studio 2022 and the Windows SDK. It is intended for personal use at the user's own risk and does not include any game files or remove DRM.