<tool> A file compression and archiver utility for MS-DOS from PKWare. It uses a variation on the sliding window compression algorithm. Comes with pkunzip and pklite and is available from most FTP archives in a self expanding format for MS-DOS usually called pk204g.exe.
If you use PKZip or Unzip you are recommended to use the latest version: 2.04g (27 Sep 1995).
WINZIP is a version with a GUI for Microsoft Windows.
A distribution in about 22 Jun 1995 claiming to be "PKZIP 3" was actually a trojan horse which attempted to reformat the hard disk and delete all files on it.
(29 Nov 1995)