I have an Xbox 360 elite I found in An old storage unit, it's not modded as far as I know. And an Xbox 360 arcade I found for $10 at the flea market a while ago. I wanted to sell the arcade since its in such good condition and I already had a better Xbox, but I decided to search the hard drive. I found 3 games downloaded, the only one I can remember Is portal. I copied them onto a usb hard drive that I used with my elite. I unplugged it and moved it onto my elite and I was able to play the game, on both xbox's, at the same time. So can I just download any set of files for a downloadable game and play it on my Xbox for free?