AccessibleObjectFromWindow returns E_ACCESSDENIED
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I called
AccessibleObjectFromWindow(hPDFDoc, OBJID_NATIVEOM, IID_IDispatch, (void**)&pDisp );
to get an interface to access PDF files. but in xp it returns an error E_ACCESSDENIED. when in win7 it works fun. I guess that I didn't have enough authority. I tried some setting on my computer, but all failed, I really have no more idea of this. Any tip would be great helpful.