Why can't I unpack Resistance addon file O.PBO?

File O.PBO, introduced in OFP: Resistance, has a new 46 byte prefix at the beginning of the file that prevents existing versions of all the PBO handling utilities to successfully unpack the contents of file O.PBO.

There are three ways you can overcome this hurdle:

  1. Use a hex editor to chop off the initial 46 byte prefix and save the change to a new file before running an old PBO unpacking utility against the newly saved file.
  2. Download OFP player Lobanak's itty-bitty utility, CutPBO, and let it do the dirty work for you.
  3. Download the latest version of UnPBO from The FAQ's essential editing tools page.

I personally opted for option 3 above.