Configure MIME Types Internet Information Services (IIS) serves only static files with extensions registered in the Multipurpose Internet Mail Exchange (MIME) types list. IIS is preconfigured to recognize a default set of global MIME types, and also allows you to configure additional MIME types and change or remove MIME types. These MIME types are recognized by all Web sites you create in IIS. MIME types can also be defined at the Web site and directory levels, independent of one another or the types defined globally. When you view MIME types at the Web site or directory level, only the types unique to that level are displayed, not all types inherited from the next level up. If you apply a MIME type at the global level after modifying the same MIME type at a lower level, the global-level MIME type overrides the modified MIME type at the lower level. When IIS delivers a mail message to a mail application, or a Web page to a client Web browser, it also sends the MIME type of the data it is sending. If there is an attached or embedded file in a specific format, IIS tells the client application the MIME type of the embedded or attached file. The client application then knows how to process or display the data being received from IIS. IIS returns error 404.3 if a client request refers to a file name extension that is not defined in the MIME types. Requirements
Recommendation As a security best practice, log on to your computer using an account that is not in the Administrators group, and then use the Run as command to run IIS Manager as an administrator. At the command prompt, type runas /user:administrative_accountname mmc %systemroot%\system32\inetsrv\iis.msc. Procedures
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