IIS/ cfm page / 404 Issue

I have a virtual website running off of IIS (looks like version 8.5,) and ColdFusion 11.

When I access a page as http://something.example.org/ which uses a ColdFusion template (index.cfm), the page correctly displays. However, when I request http://something.example.org/index.cfm it results in a 404.

All .cfm pages result in a 404

Other virtual websites on the same server behave correctly, returning successfully for both http://other.example.org and http://other.example.org/index.cfm

Since I just set up this new website, I'm wondering if there is an additional setting I'm just missing that prevents this error from occurring?

Pages with non .cfm extensions, like .htm & .pdf display properly.