The Free On-line Dictionary of Computing (30 December 2018):

PKZIP

    A file compression and archiver utility for MS-DOS
   and Microsoft Windows from PKWARE, Inc..  PKZIP uses a
   variation on the sliding window compression algorithm.  It
   comes with pkunzip and pklite and is available as
   shareware from most FTP archives in a self-expanding
   MS-DOS executable.

   Current versions as of 1999-10-07: PKZIP 2.60 GUI for
   Microsoft Windows 3.1x, Windows 9x, Windows NT; PKZIP
   2.50 Command Line for Windows 9x NT; PKZIP 2.04g for MS-DOS;
   PKZIP 2.51 for Unix, (Linux, SPARC Solaris, Digital,
   HP-UX, IBM AIX and SCO Unix); PKZIP 2.50 for OS/2;
   PKZIP for Open VMS/VAX.

   WINZIP is a version with a GUI for Microsoft Windows.

   A distribution in about 1995-06-22 claiming to be "PKZIP 3"
   was actually a Trojan horse which attempted to reformat the
   hard disk and delete all files on it.

   (http://pkware.com/catalog/pkzip_win.html).

   [Status, history of WINZIP, PKLITE?]

   (1999-01-16)