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					Originally Posted by  Quoth
					 
				 
				They work fine as AZW3, same source. 
The KFX conversion AFAIK uses an Amazon tool? 
 
I use an epub as definitive version for any edits. 
			
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 Yes, it uses an Amazon tool (the Previewer, Create is needed to get a print replica made and converted with Previewer through calibre).
They don't work fine as AZW3, as the renderer is slightly different. Full features are only in the KFX renderer.