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liswks()                                                           CW_CORE.PRG
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 Purpose
   To test if a file is a valid spreadsheet

 Syntax
   Liswks( cFile|nHandle )

 Parameters
   cFile         - File name
   nHandle       - Handle file is opened on

 Returns
   lSuccess

 Notes
   Liswks() tests the beginning and ending bytes of the file to see if the
   file appears to be a valid spreadsheet file.  It is useful to confirm
   the validity of a file if your application allows a user to type in a
   spreadsheet name.