Howdy Gold,
Check out this google search for .pbo related info:
http://www.google.com/search?hl=en&l...f&q=.pbo+files
I personally have never heard of them. Sorry I cant help you.
You might try searching for ".pbo file extractor".
Have a good day,
Greg
Now I have seen .PDO files in computer generated 3d drawings, but I dont think that this is what you are looking for.