Hey m8.
The "cfg" is simply a copy of the REAL configuration file for the PBO itself (its inside the pbo, that real cfg). So you can just delete the cfg - it's just a "promo" thingy to ease up the "what do we have here" for everyone.
consider it a secondary "readMe" file of lesser importance
oh, and the most important thing:
just delete the crap if ya like - it's not to be installed anywhere!
ya ONLY have to install the .pbo file