IIS8 refuses to serve up a static .wsdl file

I'm currently facing an issue I've never seen Before. I have a static .wsdl file set in the site directory and if I navigate to the .svc file it shows up just fine, but as soon as I navigate to http://www.foo.bar/service.wsdl to download the WSDL it throws up an Error 500.0

Module IIS Web Core

Notification AuthenticateRequest

Handler StaticFile

Error Code 0x80070542

Requested URL http://localhost/service.wsdl

Physical Path C:\sites\service.wsdl

Logon Method Anonymous

Logon User Anonymous

I know that there has been some "tuning" being made on this server, so that might be a reason, but is there a way to find out why it refuses to serve up the file?

The reason for me not going for the ?wsdl option is that the WSDL need to have some endpoints redefined due to Proxies etc.

Any help will be appreciated.

You'll need to add .WSDL to the list of file types that IIS will serve up.

Open IIS Manager, and in the root, click on MIME types.

Add .wsdl to the list, the type is text/xml.

This should fix your problem.