Well all of the cutscene files are in there... but everything else is in a .xxx file...which means that its either unrecognized by windows or its seriously a .xxx file. I will email the port developers and see if they are willing to tell me anything.
Always been like that, those are packages containing animations and such. There is an extractor somewhere on the web that unpacks those packages for you.
The differences between the consoles and PC content is the fact that movies are .bik(while console versions are .wmv which you can just play on your computer) and the config file "Coalesced.ini" is encrypted for PC(not for the consoles).
The config file contains settings, which characters/costumes and arena's to use, fatalities, blacklisted words for chat, ...
So they took certain precautions against adding characters and such.