Source : Free On-Line Dictionary of Computing

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 3.1}x, {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.
     
        {Home (http://www.pkware.com/catalog/pkzip_win.html)}.
     
        [Status, history of WINZIP, PKLITE?]
     
        (1999-01-16)