I got the latest paf.prx editor, and it works fine with all the editing and stuff, but if i go to save or open a file, it will just freeze :(
I'm on (crappy) Vista :(
Any way to fix this?

I mean the application freezes :(
And unticking didn't fix it :(

But what's weird is, all of the dev's other apps work..

See if changing the "startup directory" works.
To do this, make a shortcut to the program, then right-click the shortcut » Properties » Shortcut tab » change the "Start in" field to something like "C:\"

Then try running the program again.