MIME (Multipurpose Internet Mail Extensions) restrictions prevent undefined file types from being served by Internet Information Services (IIS). MIME (Multipurpose Internet Mail Extensions) Types help protect the Internet Information Services (IIS) server by preventing malicious attackers from downloading sensitive files. When a client attempts to download a file that does not have MIME type defined on the server, a 404.3 HTTP status
is logged in the IIS log files.
How to add or remove a MIME (Multipurpose Internet Mail Extensions)Type
1) Open the IIS Manager by clicking Start > Administrative Tools > Internet Information Services (IIS) Manager. Select MIME Types on the site you want to configure as shown below.
2) Inside MIME Types, click "Add" in Actions Pane.
3) Enter the file extension and an appropriate MIME type in the "Add MIME Type" dialog box shown below.
If you want to remove any existing MIME Type you no longer wish to serve, Select the MIME type and then click the Remove link from the