Tripwire Interactive Forums

I have looked pretty deep for tutorials to answer my question, but each one seems to skip this part for some reason.

I found a mutator online that is close to what I want, but I need to change a few things.

My question is how can I decompile this mutator, make changes, then recompile it?

I have tried simply editing the .u file in notepad, but as soon as I save it, it doesn't work. I have also tried running the ucc.exe file in command prompt, and it says it can't find steam and crashes.

Does anyone know how to do this, or know of a tutorial that doesn't skip this part?

Thanks very much for your help.