IsZip( cFile )-> <lIsZip>
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 PARAMETER:

  <cFile>     Is the filename of the archive to examine


 RETURNS:

  <lIsZip> is TRUE if the tested file is a ZIP archive


 DESCRIPTION:

  This function returns TRUE if a given file is a ZIP archive. It can be used
  to verify a file before using GetFirstInZip() on it.


 SOURCE:  

  SOURCE\FUNCTIONS\UNZIP.C