August 29, 2001
ViewHTML.cpp around line 721...

void CHtmlView::OnNewWindow2(LPDISPATCH* ppDisp, BOOL* bCancel)
{
   // default to continuing
   bCancel = FALSE;

   // user will override to handle this notification
   UNUSED_ALWAYS(ppDisp);
}

I just glanced through the code and figured that there is
something un-intended here...
I wonder if MFC support at M$ knows...

Jan