User-Mode Driver Framework Extensions (Wudfext.dll)
Extension commands that are useful for debugging User-Mode Driver Framework drivers are implemented in Wudfext.dll.
You can use the Wudfext.dll extension commands in Microsoft Windows XP and later operating systems. Some extensions have additional restrictions on the Windows version or UMDF version that is required; these restrictions are noted on the individual reference pages.
For ways to use these extensions, see User-Mode Driver Framework Debugging.