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Old 11-29-2012, 03:00 AM   #6
Agama
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Posts: 651
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Join Date: Jul 2010
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Device: PRS-300, PW2
I think that perhaps the toc.ncx is a mandatory item in an ePub, and therefore calibre generates a default when you do not create one.

I checked a small ePub with the IDPF validator, (http://validator.idpf.org/), after removing the toc.ncx file and its reference in content.opf: it failed validation with a message that indicated the ncx was missing. Putting the toc back caused it to pass validation, comfirming that this file is required.
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