The server can't find a solution for existing files

The operating system of the LAN server is Windows Server 2003. When browsing the files in the Web server built with IIS 6.0 on the server, the HTTP Error 404 - File or directory not found message is received. This message indicates that the target file was not found, but the file to be viewed is actually a real file, but it is not a common file format. How can I solve this problem? The reason for this problem is that earlier versions of IIS included a wildcard-style MIME mapping, which allowed IIS to process any file without regard to the extension. IIS 6.0 has higher security requirements. By default, it does not include a wildcard-style MIME mapping, so it cannot handle any type of file other than the MIME mapping definition. The solution is: 1. Right-click the “(ServerName) local computer" option in the "Internet Information Services (IIS) Manager" window to execute the "Properties" shortcut command. Click the “MIME Type” button after opening the Server Properties dialog box, and click the “New” button in the Opened MIME Types dialog box. 2. Then enter the suffix name of the file that failed to open in the "Extensions" box of the "MIME Type" dialog box that opens, and enter application/octet in the text box to the right of "MIME Type". After the -stream command, click the “OK" button to apply the new settings. Restart IIS 6.0 to handle the type of file you just added, as shown. Add MIME type