Modding Question

I remember some time ago that Nexon Kinda patched modding by resetting the files or something. I think i remember that in order to mod, modders had to inject the files in game and to mod again, they inject the next time they start up combat arms. I'm just wondering if its still like that or its back to the inject, start up, and play. Because of that, i stayed away from Modding because of the annoyance. So, staying away from modding, How do people inject mods now?