No you can't It's mostly because of how the Xbox reads the data in those files. From what I understand Microsoft puts all of there DLC in some kind of Special Live file so that it can be read on a Xbox 360 console so the Xbox basically reads only those files. That's why modders mess around with there console so it can read and process data that it shouldn't be able to read. That's why you can't download a mod put it on your Xbox and expect it to work. At least that's what I've gathered from picking around the internet it makes enough sense to me.