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  Name:     f_header() - get the header size in a DBF file
  Usage:    <integer> = f_header(<DBF_file>)
  Params:   string <DBF_file> - DBF filename to check
  Returns:  integer equal to the header size of the DBF file

 ---------------------------------- Example ---------------------------------

                 if f_isdbf("employee.dbf")
                      hsize = f_header("employee.dbf")
                 else
                      ? "File is not a dBASE III DBF file"
                 endif

  Note:     Any file that has an 83h or a 03h as the first byte in
            the file can be mistaken for a dBASE III file.