, allowing you to modify game saves, profiles, and achievements using a PC and a USB drive. A PC running Windows to host the Horizon application . A USB Drive formatted for use with your Xbox 360. Your Xbox 360 Console to transfer files. Step 1: Move Files to USB
Thousands of users in the /r/Xbox360 subreddit still use Horizon to this day for single-player games like Fallout: New Vegas or Mass Effect 2 without any bans. The key is moderation.
: Horizon is a Windows-based tool used to modify Xbox 360 files; it is not an "app" that runs directly on the console itself. How to Use Horizon | An Xbox 360 Modding Tool