Actually, I'm not totally sure.
Rawcode on the support forums said:
to someone wanting to disable to Mass Fabricator. I don't know if it can be edited by Notepad. Probably not. There should be a way.
It cannot. First IC2 is ofuscated (Probably encripted what do i know) so you only get jibber jabberish instead of the actual code, and second notepad suck for that kind of task. You need to either use notepad++ (Wordpad maybe could work i dunno) or need a java IDE for it.