…or so says Microsoft. A colleague of mine at an unnamed company that makes Extenders and the like has confirmed this, and it appears Microsoft published a KB article in December of 2012 confirming this as well…
http://support.microsoft.com/kb/2796618
So, if you’re using a Media Center Extender, and it’s NOT an Xbox 360, do NOT upgrade your Windows 7 Media Center box(es) to Windows 8, or your Extender(s) will stop working.