Well if i can get a video tutorial to edit scopes then that would be awesome!
Also i figured out how to edit the warrock muzzle flashes!
paint.net will definitely work for modding
Try use also a Adobe Photoshop (updated version)
use PAINT.net .. !! the best make a modding .. !
I think The best Look gives Photoshop; If you know how to use it, I've been failed many times, then I Successfully!