404 - 找不到文件或目录（web.config文件） - 但文件是存在的

I enter my url and it shows the directory structure. There are some folders, which I can navigate to just fine, plus a Web.config file. I click the link and get the 404 error. The same thing happens for my Global.asax file. Why can't my file be found?I enter my url and it shows the directory struc