Open filename with the appropriate application
        Redirect to the right widget (txt -> editor, spydata -> workspace, ...)
        or open file outside Spyder (if extension is not supported)

def open_file(self, fname, external=False):
        """
        Open filename with the appropriate application
        Redirect to the right widget (txt -> editor, spydata -> workspace, ...)
        or open file outside Spyder (if extension is not supported)
        """
        fname = to_text_string(fname)
        ext = osp.splitext(fname)[1]
        if encoding.is_text_file(fname):
            self.editor.load(fname)
        elif self.variableexplorer is not None and ext in IMPORT_EXT:
            self.variableexplorer.import_data(fname)
        elif not external:
            fname = file_uri(fname)
            programs.start_file(fname)