Why does the OAC CWC/RES campaign conversion not include the voice files?
Codemasters did not give OAC (or anyone else) the permission to distribute the voices files. We accept this decision. That said, you can easily unpack the OFP version of the CWC/RES campaign, delete all but the .ogg, .wss and .wav files and copy the voices files into the OAC CWC/RES campaign conversion.