Running apps using WPF on previous versions of Windows

Hi all,

I'm working on a new application at the moment and we'd like to take
advantage of the WPF UI style/library. What I haven't been able to find an
absolute answer to is whether there is some type of runtime that we can
bundle with our application that will allow users on Windows 2000 and/or XP
to run the application.

Or, do we need to build a different interface if we wish to support these
applications? Are there any other requirements for non Vista users?

Thanks in advance for any input.

- Chris.