Hi Mr. E,
It got me curious... Did just a little digging.
From what I see it does not seem like an easy thing off hand.
It seems to be an odd file within the compressed sound.dat file... A ".pmf" file.
There are refs to PlayStation Movie File and Published Map File, do not know if it is either or if related.
Could even stand for Papyrus Multimedia File(wild guess).
Some Information I found.
Not sure if this will help.
Blitz