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No unless you count extending your computer to an Xbox 360 via Media Center... which last time I checked you could get the video to work but no audio. But if your computer is RIGHT next to yout console like mine is just turn up the volume on your computer and play on the console. Downside I believe is you still need to use your keyboard and or mouse... but otherwise no method of converting RMXP files... yet. However I was thinking of getting some people together because apparently using the XNA Game Creators Club you can make games and upload them for others to download and play for free. If we could convert RMXP files to be used as if they were made in XNA then... there you go. But still the OFFICIAL answer is no... you cannot do it.