I've got an Xbox 360 Arcade. I don't have Xbox live or internet access @ home. So I've hooked up an external HDD to the Xbox also to try and play movies. My movies are (I think) in AVI format which the std Xbox software doesn't support. Now since I don't have access to xbox live to upgrade the software, can I perhaps download software from my work pc and copy to it to my ext. hdd & install on my xbox?