I have used PMS for my PS3 with no trouble at all, and it works fine for my Xbox when I have files in mkv format. However, I prefer to view them in mpeg because the transcoding process really kills my laptop, and mkv2vob works fine instead. However, when I try to play mpeg or mp4 or an avi format, the xbox tells me it is unsupported. I am really hoping somebody can help me with this problem, because viewing mkv's is almost not an option. And I know the solution is probably obvious, but I've been trying to fix this forever. Thanks for the help guys.