Ever wanted to add a custom mime type to your Web server? I ran into this issue the other day when I tried to serve up .otf files related to fonts on my Web server and I got this error: 404.3 error - mime type missing!
Thankfully, adding mime types is easier than ever thanks to the all-new distributed configuration option, which allows for IIS7 configuration to be stored in web.config files, along with asp.net configuration, to be deployed with your content.
I'll show how easy it is to add mime types to your Web server. This method will work on any IIS7 web server, and it will be ignored on all non-IIS7 web servers, so it should be safe to do no matter the type of application or content. Since the <staticContent> section is delegated by default, the configuration snippets below should 'just work' on all IIS7 Web sites.
- Open or edit the web.config in your site home directory.
- Add the following section in configuration section under web server.
<system.webServer>
<staticContent>
<mimeMap fileExtension=".otf" mimeType="font/otf" />
</staticContent>
</system.webServer>
This works even on Go Daddy hosted server also. You can add as many file times you want allow in this static content section. For example these few MIME types you can add if you want on your Web server
<mimeMap fileExtension=".m4v" mimeType="video/m4v" />
<mimeMap fileExtension=".ogg" mimeType="audio/ogg" />
<mimeMap fileExtension=".oga" mimeType="audio/ogg" />
<mimeMap fileExtension=".ogv" mimeType="video/ogg" />
<mimeMap fileExtension=".webm" mimeType="video/webm"/>
<!-- For silverlight applicaitons -->
<mimeMap fileExtension=".xaml" mimeType="application/xaml+xml" />
<mimeMap fileExtension=".xap" mimeType="application/x-silverlight-app" />
<mimeMap fileExtension=".xbap" mimeType="application/x-ms-xbap" />
Hope this helps 
