copy image to windows clipboard?

Is it possible either with core tcl or an extension to copy an image from a tk application to the Windows clipboard? If it is possible, can anyone give me a concrete example?

I want to be able for a user to do a copy/paste operation of an image between my tk app and a Windows app such as powerpoint.

I'm not looking for any other mechanism to get images into a Windows app; I specifically want to be able to put images onto the system clipboard.
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