Whenever I want to play mp4 files from an external drive on the 360 it says they're not currently supported and to go online. I do, plug in cable and then sign-in to live. Only then will I be able to watch the files. But I have to do this every time I want to watch them. WTF? anybody have this? I don't mind that much being plugged in most of the time but I worried if the net goes down some rainy Sunday I won't be able to enjoy watching some flicks cos of it.