shell32: Use GetUIObjectOf instead of BindToObject to get a IDropTarget object

[Michael Jung]

As the unit-tests show, you can't bind to _files_ in WinXP's shell namespace. 
This means we have to use GetUIObjectOf instead of BindToObject to get a 
shell namespace object's IDropTarget object.

Changelog:
	Use GetUIObjectOf instead of BindToObject to get a IDropTarget object

Bye,
-- 
Michael Jung
mjung at iss.tu-darmstadt.de
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