WIN32OLE_METHOD#helpfile
Instance Public methods
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