The only legitimate way to play the original Forza Horizon on a modern computer is through Xbox 360 emulation. Programs like allow Windows PCs to run original console discs or digital backups. System Requirements for Emulation

Because the game was never officially ported to Microsoft Windows, PC gamers have sought alternative ways to enjoy this classic, such as using Xbox 360 emulators (like Xenia) or looking into compressed PC repacks. However, navigating the web for unofficial files carries significant digital risks.

Since it’s an Xbox 360 game, an Xbox controller is plug-and-play. Why Forza Horizon 1 is Still Worth the Effort

Be cautious of unofficial "PC repack" downloads from file-sharing sites like Mediafire. These are often unofficial emulated bundles or malicious software, as no official PC installer for Forza Horizon 1 was ever produced.