My Zune 30, last time I looked, has some MP4 files on it (movies) and of those MP4 files, there are no wmv counterparts for the MP4 videos that are on the zune and yet it plays them when I access them from the video menu. the 1.x firmware didn't have software mp4 codecs in the zune and thus... the zune 30 could not play them, now with the zune 30's version of the 2.x firmware, it supports MP4 videos via software codec support. THAT is why the zunes have 533Mhz CPUs .. the zune 80 has a built in MP4 decoder, but the 30 can play mp4s too, very limited on which files it supports, and if the MP4 isn't directly supported by the zune firmware / hardware, the zune software converts it to WMV. I think it has nothing to do with flawed or hacked files on zune, because by the time they hit the sync software - the sync software ignores files it isn't sure about... I've watched the sync software ignore 10s - 100s of files I've sent to the cue.
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