The DX is no ePUB reader, so why should it use the ncx? I know ePUB3 does not use the ncx anymore, and I feel it is a bad change...
I know some like the HTML TOC, I just don't. I do get annoyed by them, but not enough to remove it from the book first or not to read the book at all. Bad formatting will do that, but not the precense of a HTML TOC.
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