I found the file on an old forum thread titled "FH5_DEV_BUILD_99.exe." As a die-hard fan, I thought it was just an unreleased beta or a modded version with hidden cars. I downloaded it, bypassed the "Unsafe File" warnings, and launched it. The First Red Flag
Understanding the Forza Horizon 5 Executable: A Guide to Locating and Fixing "forza horizon 5.exe" forza horizon 5.exe
Adding specific commands to the Steam launch options can improve stability: I found the file on an old forum
DXGI_ERROR_DEVICE_REMOVED → GPU driver crash. Lower your overclock.FSD_Streaming_Timeout → Your hard drive is too slow. Move the game to an NVMe SSD.LiveLogin_TokenExpired → Sign out and back into the Xbox app.