How to: Determine the Installed Version of Windows Presentation Foundation
The version number for the current installed version of Windows Presentation Foundation (WPF) is located in the Registry.
To find the version number:
On the Start menu, click Run.
In Open, type regedit.exe.
Open the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.0\Setup\Windows Presentation Foundation
The WPF version number is stored in the Version value.