Ok I'm getting some information from Pace:
The DC-50X uses a new remote protocol called XMP. Check to see if it can
emit IR codes using the XMP protocol.
Here is a link that has a little info on the XMP protocol. http://www.uei.com/html.php?page_id=89
If the Microsoft remote your using do not emit codes using XMP protocol it
will not work with the DC 50X.
Pace Technical Support