def launch_app(self, tree_path):
file_type = self.liststore[tree_path][TYPE_COL]<EOL>app_infos = Gio.AppInfo.get_recommended_for_type(file_type)<EOL>if app_infos:<EOL><INDENT>self.launch_app_with_app_info(app_infos[<NUM_LIT:0>])<EOL><DEDENT>else:<EOL><INDENT>pass<EOL><DEDENT>
用默认的程序打开这个文件链接.