It doesn't associate on setup. You have to open 7zip, go to options and you see this http://i.imgur.com/12dpE7G.png http://i.imgur.com/12dpE7G.png I usually cl

It doesn't associate on setup. You have to open 7zip, go to options and you see this http://i.imgur.com/12dpE7G.png http://i.imgur.com/12dpE7G.png I usually click "Select all" then unselect ISO. Done. Edit: other person replied it must be opened in Administrator mode. That explains why I didn't have it associated.