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					Originally Posted by  BetterRed
					 
				 
				Follow these steps: 
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 OK, much appreciated. Added the variable,  ran calibre-debug --default-programs=unregister before and after, restarted twice, checked to make sure the variable is there. Still getting the Add Duplicate dialog. Screenshot attached in case of un-clarity.
Am I supposed to run calibre-debug --default-programs=register ?