Had another look and it is looking increasingly like a bug in Microsoft Windows.
It seems that Windows can only see the metadata in 24-bit WAV files if the length of the audio is an exact multiple of 3 samples.
Try this: Before exporting as 24-bit WAV, set the Selection Toolbar to show the length in "samples" (http://manual.audacityteam.org/man/sele ... onposition), then if necessary, trim or extend the track so that the length in samples is an exact multiple of 3. Then after exporting, test to see if the metadata is visible to Windows (Right click -> Properties -> details).
Feedback and Reviews for Audacity 2.x