删除指定天数前的文件，能设定每天定时运行，能指定文件的扩展名，可区分文件的修改时间和创建时间，设置好后还可加密码，并且可最小化到托盘图标-delete the specified number of days before the document can set regular daily operation, the document can be designated extension, The document can distinguish between modified and