What I meant was, the part of the pz2 file you posted looked like this:

{
    version
    {
        number 3
    }
actor BODY

right?

All the pose files I've looked at look like this:

{
    version
    {
        number 3
    }
actor BODY:1

the difference is just that :1 on the end of where it says actor, I'm almost certain that is what's causing the pz2 not to load, the bad news is there's an actor line for each body part that is effected by the pz2 so you'd have to go through the file & add :1 to the end of each line, the good news is it shouldn't take more than 5 minutes ;)

Windows 7 64Bit
Poser Pro 2010 SR1