OpenCart has one flow in correct handling 404 pages when user (or search bot) go to links like this:
example.org/tv/long_waste_link_here
or
example.org/imac-22/another_waste_uri
or
example.org/about_us.html/this_is_waste_link

In all this cases OpenCart returns 200 OK, but actually the are no such link!

This vQmod extension fix this, so for all incorrect links now OpenCart response 404 Not Found, this is nice for SEO :)