WP8 (Lumia 920) Can't play .wav files from Email

UGH! I tried listening to an attached .wav file from my cisco Unity Voice Mail system. The same files open up fine on my WP7.5 Samsung Focus S. The message says: Sorry, we can't play this file on your phone. This occurs on a Lumia 920. Has anyone else seen this? If this is a O.S. issue, do you think I have to wait 6 months for WP8.5 fix?