Conditional Style Sheets in IE9

Question

IE9 is supposed to support conditional comments. I have the correct MIME type: 'type="text/css"'. All of the other conditional style sheets are being read into the correct browsers.

Here is what I cannot get to read in:

<!--[if IE 9]><link rel="stylesheet" type="text/css" href="includes/ie9.css"><![endif]-->

It is in the head with the rest of them, yet will not show up in the head in IE9.