I'd have to say this is the easiest subject in the world to look up on this web site. I'm sure its in the FAQ. I know there are many threads on the subject.
You have to ask yourself, did you even read the "Read This First" or FAQ sections?
Anyway, yep, its one of the few common problems with the NSX. The plastic handle behind the opening in the door is where it breaks. You have several choices to fix it:
o OEM (plastic, expensive)
o used OEM (plastic, limited availability)
o stainless (from a vendor easily found on NSX Prime - not sure on $$$)
o door-fix-it-thingy that NSXTASY pointed out
I went used the first time mine broke many many years ago. After the 2nd, I have now done the door fix it thingy on both doors.
While in there, you might consider doing the window fix it thingy from Dali Racing also. And, while in there, I'd re-lube the window tracks (forget the name right now).
If you do all this yourself, it will take a while and may be a bit frustrating. There are some good write-ups on NSX Prime. (Please do not ask how to do this until you read what has already been written.) But, once done your door handles shouldn't break again and your windows will work better or for longer
than they would otherwise.