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Mitthrawnuruodo said:
I guess it's because aac can either be MPEG2 audio layer or MPEG4 audio layer... and this way you know which... ;)

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.AAC was already taken for the MPEG-2 version of AAC, so .M4A was created for AAC's MPEG-4 incarnation.
 
ftaok said:
I thought this was a thread about Duke University and their iPods.
I'm not surprised. "ACC" is a common misspelling of "AAC", especially on these forums.

EDIT: Of all words I could have spelled incorrectly, "misspelling" was the one I got wrong :eek:
 
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