This threw me for a while this PM.
I'm meddling about with a Windows Server 2012 R2 box, adding the WebSphere Application Server (WAS) Plugin, using Microsoft Internet Information Services (IIS), which is part of W2K12.
Part of the configuration requires one to configure the Internet Services Application Programming Interface (ISAPI) filter into the mix.
And yet I couldn't find it ....
Hey, guess what ... IT WAS NOT INSTALLED
Off to Server Manager, and there it is ....