Hey guys, I've actually been wanting to work out how to do this for a while. I'm working on a machinima show using RFG and would like to be able to extract the sounds form the game to incorporate into my sound design.
I've gotten as far as using the Gibbed unpack tool to extract the .xwb_pc and .xsb_pc files from the sounds_r.vpp_pc file installed with the game. But then extracting the audio files from these .xwb_pc files has me stumped.
I've tried using XWB Extractor v1.1 but it doesn't recognise the _pc files. Renaming the file extension allows me to unpack the .pcm files, but just like you experienced, they are all either 0kb or rediculous file sizes and just data noise.
I've also tries using both eSEX and EkszBox ABX to try and extract the xwb_pc files but both of them refuse to open them. So it seems the _pc files are quite different from the standard .xsb files. It's very frustrating as I can see all the files there, I just can't seem to extract the audio.
I have an old tech demo of the show if anyones interested in seeing where I'm going with this: http://vimeo.com/69959934
Any further help on this much appreciated