Mac Gaming Mods

Hello,
For the first i'm sorry for my bad english
I'm french ans i search an solution for the file sitx. I downloaded the files:
MASP_Masiros_Pistols.sitx
OP_13Alpha.sitx
UG_on_GR.sitx

But i'm playing raven shiel in pc platform. Please help to use this files.
Thank's !

You need Stuffit Expander to open those files. UG on GR will not work on a PC but the other two will.