WAV file playback on Mac computer

I have a recorded call on the USB memory stick thats inserted in the VVX 601. When I remove the USB stick and insert into my MacBook, I see a lot of files on the USB stick, however, I can't locate any WAV files. I have searched, sorted by size (phone say's it's a 75MB recording), search by date, etc. Where are the WAV files stored?

Thanks,

Adam