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  -w<h,s>   Take hidden, system files
  -W<h,s>   Skip hidden, system files (used to override configuration file)

  Normally PKZIP will skip any Hidden or System files that fall within the
  files specified for compression.  (See the -j option and your DOS manual
  for an explanation of what Hidden and System files are).

  If you wish to force PKZIP to take Hidden or System files you may do so by
  specifying the -w option, combined with the appropriate attribute.  These
  attributes will normally be stored as part of the .ZIP file information
  unless specified with the -J option.

     pkzip all.zip -whs a:\*.*

  This example would zip all files in the root of the A: floppy drive,
  including any hidden or system files.

     pkzip att_test -whs -Jhs c:\*.*

  This would take all files as above, and would also discard the file
  attributes.  This option may be made the default.  See PKZIP
  Configuration.