It does ship with one, right click on zip file -> extract all. Why are you posting incorrect information that would have been clarified to you by a 3 second google search beforehand?
It didn't ship in the distant past due to anti-competitive reasons but it is there now.
It ships with a very terrible wizard. Maybe I should say, why does the Windows unarchiving feature suck?
It doesn't ship with a working unarchive utility, the one that is included will discard anything that goes over the maximum pathname length.