kind=defined
names=helpfile
visibility=public

--- helpfile

Returns help file. If help file is not found, then the method
returns nil.

   tobj = WIN32OLE_TYPE.new('Microsoft Excel 9.0 Object Library', 'Workbooks')
   method = WIN32OLE_METHOD.new(tobj, 'Add')
   puts method.helpfile # => C:\...\VBAXL9.CHM

