Mp4/m4a podcast upload problems

I have a huge collection of AIFF files that I had exported via QT to mp4 files. As of recently, I have a group who's doing some EDU podcast related stuff who was hoping to post up my podcast list, but sent me an email letting me know that they couldn't use the mp4 files, as iTunes is interpreting them as video files, and I needed to use .m4a.
I heard from a few people on the boards that there's no fundemental difference and that renaming should be fine, although when trying to publish, we're getting this error:
"iTunes U could not update the content in this group because iTunes U encountered an unsupported enclosure extension in the specified RSS feed at iTunes Podcast Subscription. Until the issue is resolved, iTunes U continues to display the last downloadable version of the content. Verify that the RSS feed enclosures contain only approved content types (mpeg audio, mp4 video, quicktime video, PDF application, mp4a-latm audio) with the appropriate file extensions (mp4, mp4, mov, pdf, m4a) and then try again."
Does this mean we need to reencode all of our mp4 audio to m4a? If so, is there any way to avoid the recompression (to avoid the long hours of reencoding + potential loss in quality)?

Henry,
Sorry, but this is a "me too" post. I've been podcasting since Oct. of 2004 and I noticed this same problem with our podcast since I changed to AAC/m4a. I've checked and rechecked the xml, and even use identical code for our vodcast/enhanced podcast and it updates fine. Interestingly, they both work great in NetNewsWire Lite, so i really think this may be some glitch with iTunes. I know this doesn't help you, but perhaps it will shed some additional light on things.

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