HELP!

I don’t know if this thread is in the right place, but I desperately need help with ripping the audio out of a PSP game. The game has audio in .SKX format. How do I open this or unpack this? There are also many .HOG and .HGZ files. I can’t figure out how to open any of these. I already found the .at3 files and converted them, but there were hardly any. The game I’m trying to rip is Syphon Filter Logan’s Shadow. I know orangec made a rip of it a while ago and it was much bigger than mine. My rip is only 50 megabytes. Can someone please help me on how to open these files? Thank you.