Ok i found it! Here goes:

You will need to access Internet Information Services and right-click on Web Sites and select properties. Select the HTTP Headers tab and click on MIME Types. Here you will add two MIME Types:

Extension: jad
MIME type: text/vnd.sun.j2me.app-descriptor

Extension: cod
MIME type: application/vnd.rim.cod

You may need to restart IIS once you've added the MIME types. Open the command prompt and type in "iisreset" (minus the quotes).
Credit goes out to Huy Nguyen at link (firepowr.net/index.php?entry=entry081206-151855)