Not sure about the Windoes XP 64-bit question, but I can answer the DVR-MS one. I assume by mp3 you mean MPEG2 or MPEG4 (mp3 is an audio format only).
DVR-MS is used because MP uses the MCE Stream Buffer Engine to do the timeshifting and recording. The team have been working on a new engine that will record to TS (and MPEG later), but in the mean time, it has been decided to stick with DVR-MS until MP is rock-solid before switching to the new engine.
IIRC, there is an option in MP to automatically convert recordings - not sure as I don't use that feature.
Sam |