The home page for addZip, a shareware Zip library. Libraries and controls available for 16 and 32 bit versions of MS-DOS and Windows, with support for various compilers. This is a commercial product, but an evaluation version of the library is available.
One DataCompression.info user complained that the support from the supplier is poor. Another offered this comment: The software is good. Lacks some minor things which the supplier promised he will upgrade, but never replied to my mails. Apart from the support, the software is quite good..

http://www.littlebigware.com/addzip.html