Yuri, I know as much as you do, well, actually, less for I do not use dynazip or this method, I use, and I am quite happy with it, a very old library called eeva zipmaster (http://www.eetasoft.ee/zipmaster.htm), which I mainly like for it allows me to implement its events and show the progress of the operations, which it might be very common with the other libraries, but when I started using this one, it was the only free one that allowed it.