Ctrl-Del when assigned to File/Close doesn't work

the Ctrl-Del key combination assigned to the File/Close menu item doesn't work.
Just nothing happens after pressing Ctrl-Del

I'm using v.7.1.1.1339 on Windows XP

what might it be?
 
Apparently this key combination is intercepted by the editor (though nothing happens in the editor). We'll check it out.
 
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