I tried for like a day a LONG time ago. It uses the unreal engine just like R6, has umd's too. There are two "engines" for the game, single player and multi player. The multi is in the adv folder of the game, and the multiplayer game can easily be launched by running the sp3_adv.xbe, which allows you to skip the intro movie and the first main menu

If you rename the sp3_adv to default.xbe, you can still play single player, you just have to hit back where you select your profile and it will load back to the main menu (still no movie if I remember correctly.)