I have been using my P3 to playback video from my 16 core MAC PRO (8 cores for transcoding). Purchase XBOX 360 Elite, connected it to my network and it found the MAC PRO immediately running OSX PS3 media server. My question is : how could this be without downloading the Window version of PS3 media server. The XBOX plays some MP4 files but mkv file either does not play or I get error code 68-80004005. Not complaining, just looking for understanding of the process.