RLyon,
The Voice Processor saves messages in one of two formats.
G.729A (8 kbps) - Default
G.726-32 (32 kbps)
So no there isn't a way to directly export these as .wav files. That doesn't mean that once you export them you can't convert them from to .wav if that is what you want.
Keep in mind not to change the format of what the VP saves in as that also affects the playback of any of the previous messages; they will be garbled.
Thanks,
TE