FF7:CC/Video Formats

Known FF7:CC Video Formats

• [PSMF]

PSMF Format

Stub

[PSMF] Video files are PSP-format videos.

And, I think I know how to get the audio within a pmf file. You need MPlayer to extract the at3 from pmf file and 
use a homebrew called 'at3decode test' written by Z33 to decode it to wav.
here is the guide http://www.psp-hacks.com/forums/f134/guide-convert-pmf-to-avi-t159985

Finally, as far as I know, there is no other way to decode the at3 to wav in Windows or any environments. 
It can be done only on PSP. In short, psp system has to decode the at3 first to play it and Z33's homebrew 
simply takes this moment to decode it to wav (of course, it's not as "simple" to complete such great work at all Cheesy) 
--SilverWings