You will need the iso or xex file of the Xbox 360 version, not a "portable" PC file.
Play the game on console, buy a legitimate copy, or try other smaller racing games on PC. If storage or bandwidth is a concern, consider upgrading your hard drive or using cloud gaming services. forza horizon 2 highly compressed 500mb portable
Keep in mind that official online services for Forza Horizon 2 have been shut down since August 2023. Conclusion You will need the iso or xex file
Often a pre-configured emulator (like Xenia) bundled with the game ISO, requiring no installation. Key Features of Forza Horizon 2 buy a legitimate copy
Visual data for cars, roads, and environments.