How can your demographics show if IE users want your games when you don't support them?
What I added to my web.config file:
<staticContent>
<mimeMap fileExtension=".ogg" mimeType="audio/ogg" />
<mimeMap fileExtension=".m4a" mimeType="audio/mp4" />
<mimeMap fileExtension=".webapp" mimeType="application/x-web-app-manifest+json" />
</staticContent>
The last one was for Firefox's market for the manifest it needs to load off my site.