Ok, here's the fix to get their files off yer camera into PPCS5:
You need to get MainConcept Reference, open any of yer files on the camcorder drive, the settings to export the files are this:
What worked good for me to get both the audio and video files into PP as one file, yet show both files for edit is XDCAM HD: XDCAM HD 4:2:0 1440x 1080 VBR 17.5 Mbps, this reduces the size of the frame a little but not much, and keeps the conversion time down a bit. I read off one drive and write to another.
I do not understand why you need Mainconcept.
CS5 can edit mp4 quite easily.