NDS Editor is a hacking tool for NDS ROM games.
For example, I (Roozy) extract my NDS ROM, Rabbids Go Home for music, sprites, and sounds.
If you wanted to rip your NDS ROM in your computer, be sure to look at the HackRomTools page. Or, actually, Google search "nds editor download".
If you don't want to, don't download NDS Editor, if you aren't interested of editing NDS ROMs.