Today, WolfETPlayer released the source code for RealRTCW 2.2
Almost every change is marked with RealRTCW tag. Source code also available on Github: Github.com
You can do whatever you want with this source code. Just dont forget to mention WolfETPlayer and ioRtCW author if and when you do make changes.
Download the source code here:
Source: WolfETPlayer on MODDB