Just restart the XBox now and enjoy the payoff! XBox Media Centre will play any file format that you throw at it, including MP4, MKV, OGM, DIVX, Xvid, and supports iTunes Network Play, album art, and some kick-ass emulators (those you will have to install yourself besides FCEEmu (NES Emulator included with the installation, but you have to supply the roms, naturally). Now i do not recommend playing movies off of the USB as it is only 1.1 (slow data transfer rate). Network or DVD Drive is recommended (that may be in another tutorial
). As well, this WILL allow you to play Backups (burned games) but if you make your own backups, burn them at a low speed, and use DVD-R (some drives have been shown the ability to recognize the +R, +RW, as well as CD-R). Enjoy!!