UnZipFile( cFile, cOutFile, nOffset, hWnd  )-> <nRetCode>
------------------------------------------------------------------------------


 PARAMETER:

  <cFile>     Is the Filename of the archive to open

  <cOutFile>  Is the target name of the file to extract. This string is 
              found in element no. 2 of the info array returned by
              GetFirst/NextInZip


  <nOffset>   Is the offset of the file to extract within the zip archive.
              This value is found in element no. 7 of the info array
              returned by GetFirst/NextInZip

  <hWnd>      Is the handle that identifies the window who will receive 
              the FN_UNZIP Messages from this function. The appropriate 
              windows method Unzip() will then handle the message and
              evaluate the bUnzip Codeblock, which in turn can provide
              a progress indicator.     



 RETURNS:

  <nRetCode> is zero if the function is successful



 DESCRIPTION:

  This function extracts a selected File from a zip archive. Please see 
  GetFirstInZip() and UnZip() for an example.

  Note that the INFO_ZIP.DLL, which is provided with FiveWin, has to 
  be in Windows search path !


 SOURCE:  

  SOURCE\FUNCTIONS\UNZIP.C