Windows Azure - Serve unknown (mp4) MIME types in Windows Azure IIS storage

To configure the mime type, create a new web.config file with this content in the video folder:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.webServer>
     <staticContent>
        <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
        <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="7.00:00:00" />
     </staticContent>
  </system.webServer>
</configuration>

This solution works for Azure only, the local project may no longer work. My solutions is to use "Add Config Transform" for the plublication with an empty web.config file for local project:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
</configuration>

And when you right click on web.config, select "Add Config Transform":

In the web.Release.config file add this into de configuration tag:

<system.webServer xdt:Transform="Insert">
  <staticContent>
    <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
    <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="7.00:00:00" />
  </staticContent>
</system.webServer>

I used suggestion from https://social.msdn.microsoft.com/Forums/azure/en-US/79eb0c22-fe78-41d6-ac57-03055610b2a8/mp4-media-files-on-azure-website?forum=windowsazurewebsitespreview&prof=required:

<staticContent>
  <remove fileExtension=".mp4"/>
  <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
  <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="7.00:00:00" />
</staticContent>

Can you not add custom mime type in web.config? I just ran into this link:

http://www.iis.net/ConfigReference/system.webServer/staticContent/mimeMap

The relevant web.config xml is:

<configuration>
   <system.webServer>
      <staticContent>
         <mimeMap fileExtension=".syx" mimeType="application/octet-stream" />
         <mimeMap fileExtension=".tab" mimeType="text/plain" />
      </staticContent>
   </system.webServer>
</configuration>

Hope this helps.