(2012) was an Xbox 360 exclusive. It was never officially released for Windows. Emulation:
Do not click the first Google result. Use specific syntax: Forza Horizon 1 Pc REPACK Download Mediafire
To run Forza Horizon 1 smoothly via emulation, your PC will need more power than a native port would have required: (2012) was an Xbox 360 exclusive
If setting up an emulator feels too complex and you are simply craving the "Horizon" experience natively on your PC, Turn 10 Studios and Playground Games have officially brought the later iterations of the franchise to Windows. You can easily purchase and play: Forza Horizon 1 Pc REPACK Download Mediafire