Support ability to open .wav files on Windows Phone - we can't get voicemail [updated]

I GET MY VOICEMAILS EMAILED TO ME IN A WAV FILE.... BUT NOW THE NEW 920 IS SAYING THAT I CANNOT LISTEN TO THIS FILE.

I WAS ABLE TO ON MY 900....WHY NOT NOW?

IS THERE SOMETHING I NEED TO DO?

OR
IS THERE SOMETHING MSFT FORGOT TO DO TO AUTHORIZE THIS TYPE OF REPLAY.
AGAIN
IT WORKED ON MY WINDOWS 7 AND 7-5 SOFTWARE BUT NOT ON THE 8
PLEASE HELP ME MSFT
THANK YOU FOR ANY HELP

LARRY

Source: http://windowsphone.uservoice.com/forums/101801-feature-suggestions/suggestions/3378998-support-ability-to-open-wav-files-on-windows-phon

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