Yes, this is entirely Media Center handling this part.... I did a quick search and found this, but I don't know if it will help you any.
http://experts.windows.com/frms/windows_entertainment_and_connected_home/f/114/t/102894.aspxThere may be more helpful articles elsewhere, but you will probably get more eyes if you post on the Windows Experts Community since this is a strictly Media Center issue.