Trying to rip models from PS3 .xxx files

[Plamz Doom]

So i was going to rip some models from Transformers War for cybertron, fall of cybertron and dark of the moon. However all the files are encrypted in a file format i do not recognise, that being .xxx

So i was wondering if anyone new how to decrypt and get the models, textures, sounds, etc from these games because searching online for what a .xxx file is and how to open it comes up with very little

Thank you