24 bit audio not playing in Quicktime

I have captured some video through an a Matrox MXO2 in Adobe Premiere CS6 and end up with 24 bit PCM audio in my .mov files that can't be played back in Quicktime player or any other Quicktime based application.  This happens regardless of the codec I use to capture the movies (I've tried both DV and Prores).  Quicktime's info display says there are audio tracks that are 24 bit integer, 48khz little endian stereo, but no audio plays.
I'm at a loss here as this doesn't seem to be an exotic codec or plug-in issue.

Just an addition.  I get this error message whenever I try to play one of these captured clips.
"Additional software is required for QuickTime to playback this media.  It may be available from the QuickTime Components page."
I'm not sure what component might be missing as it's supposed to be 24 bit uncompressed audio and not some third party codec.

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