Hmm... Do you have the right software to do so?? As in 7zip or something?
Yes, I have that, but it seems that every time i try to, it crashes the software. I have an old computer.
Ah, that's too bad. If you can't find a way to open it, I could note you the raw css, if you like/need it??
Oh that would be really nice, thank you. 
Of course, I'm glad I can help ^^ here, I sent you a note