Control-h reassignment in :pc mode

Hi there,

I've been trying to reassign the "Control-h" key stroke for my own  
purposes using EDITOR:BIND-KEY but that does not seem to work. It appears  
 from default msw-key-binds.lisp that this stroke is assigned to "Query  
Replace" editor command, yet EDITOR:DELETE-KEY-BINDING does not seem to  
help a whole lot and when you press it a "Replace" dialog pops up as if  
invoked from "Edit" menu.

Any ideas?