Speaking of N++, I don't suppose there's actually a plugin or language someone's made to recognize entities and whatnot?
Anyways, OP, the best place to start would have been the weebly, but for whatever reason, that's still not up (apparently there was some fight between people, idk the story) and idk if it ever will be again.
The first step though to actually modding Sins would be to make sure you get all the text versions of all the files. You can do this manually via convertData, but it may be more convenient to just download the copy harpo has posted.