I'm trying to enable NTLM authentication on a Windows Server 2008 R2 machine with IIS 7.5 for a specific file in my web root. I've been following these instructions http://docs.moodle.org/en/NTLM_authentication#IIS_Configuration
In the IIS Manager I open the Authentication module, disable anonymous authentication and enable Windows Authentication however according to every post I can find on the matter I should have a 'providers' option appear but I don't.
I've double checked in Server Manager that the 'Windows Authentication' security feature is enabled for IIS.
Any help anyone can offer would be great,