A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Here's how to do that:
Sub ExportAsWMF()
Call ActiveWindow.Selection.ShapeRange(1).Export("C:\filename.wmf", ppShapeFormatWMF)
End Sub
BTW, you might want to consider using EMF (ppShapeFormatEMF) instead of WMF, it's a more robust format that can handle more complex shapes than WMF.