def do_graphviz(self, args, arguments):
        """
        ::
        
            Usage:
                   graphviz FILENAME

            Export the data in cvs format to a file. Former cvs command

            Arguments:
                FILENAME   The filename

        """
        filename = arguments['FILENAME']
        if platform.system() == 'Darwin':
            if os.path.isfile(filename):
                os.system("open -a '\''/Applications/Graphviz.app'\'' " + filename)