Do you want to test your extensibility application for widescreen compatibility without a widescreen monitor?

If yes, then...

1. Click Start --> Run.
2. Type 'C:\windows\eHome\ehshell.exe /widescreen'.
3. Click the OK button.
4. Using the mouse, click the 'Restore Down' button to run Media Center in a window rather than full screen.

Voila, a 16:9 implementation of Media Center.