I've got some zip files coming from a very old mainframe that I would like to decompress. They will unzip with the built in windows "compressed folders" utility and older version of winzip (I read that version 12 no longer supports deflate), but I want to automate it. Free libs like SharpZipLib or ZipLib are out as they are mostly based on the built in (and much more common) "deflate" algorithm. Can anybody direct me to a component that will handle the decompression of these files? I'd even settle for the shareware command line version of pkunzip if such a thing exists anymore (although a component would be my first choice).