The VM is forwarded to the email address with which your acct is registered automatically. No other specifics required.
There is no such thing as "fake WAV files". Free or paid, your VM will be forwarded to your email.
However it is possible that you maybe lacking a codec required to play the audio file.
In terms of issues with playing the file, please expand on what you have attempted so far...
(As far as codecs go I would suggest the Mega version of the K-lite codec pack
Download K-Lite Mega Codec Pack)