Let’s not dance around the issue. unless you personally own the original disc and are downloading a backup copy in a jurisdiction that permits format shifting (and even then, the DMCA’s anti-circumvention clause makes it a grey area).
Most Xbox 360 games should be roughly 7.3 GB or 8.1 GB (for XGD3 titles). If a file is suspiciously small (like 50MB), it is likely a virus or a "downloader" executable. Never run an .exe file thinking it is a game ISO. How to Use Your Downloaded ISO
Since the Xbox 360 uses a specific file system (XGD2 or XGD3), ISOs often need to be processed through tools like ISO2GOD (Games on Demand) to be playable directly from an Xbox 360 hard drive, or abgx360 to verify the file's integrity.
Finding an is the best way to ensure the longevity of your gaming library. By using the right conversion tools and verified files, you can enjoy 7th-generation classics in 4K resolution via emulation or with lightning-fast load times on a modified console.
No Xbox 360 game is legally “abandonware.” Microsoft and its publishing partners (e.g., EA, Activision, Ubisoft) still hold active copyrights. Even delisted digital titles are not free to distribute.