Under Advanced settings, click Show hidden files and folders, and then click to clear the Hide extensions for known file types and Hide protected operating system files (Recommended) check boxes.

• 在“高级设置”框下,单击“显示所有文件和文件夹”,然后通过单击清除“隐藏已知文件类型的扩展名”和“隐藏受保护的操作系统文件(推荐)”复选框。