I would like to draw attention to the fact that the auto pre-release uninstall tool provided by Microsoft does not remove these products if they were installed on the client computer:
WinFX extensions for Visual Studio beta 1
WinFX SDK beta 1
However it did remove WinFX runtime beta 1. This is highly inconsistent behaviour because,
The SDK is useless without the runtime.
WinFX extensions cannot be removed AFTER the auto uninstall tool has completed removing the other products as it fails with the message: "A network error occurred while accessing 'C:\WINDOWS\Installer\vsextwfx.msi' ". Trying to uninstall by running the original .msi file fails with the message that 'Visual Studio must be installed' for Installer to continue.