I can confirm that the files are not changed...

I use the serial method to take zip files home from work, and they work fine. (all you would have to do with the mp3 files is to get a tool that renames them based on id3 tags)

Jazz
(List 112, S/N 00030, 4 gig blue)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)