Quote:
Originally Posted by JSWolf
I do change ePub 3 to ePub 2. I use Notepad++ or Calibre's editor to do so.
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IMHO, that's a lot of extra work with little benefit. Even the ancient ADE 1.7 app opens epub2 compatible epub3 books without any problems, because fully epub2-compliant reading apps are supposed to ignore tags and attributes that they don't support. (You're more likely to encounter ADE problems with epub2 books if a CSS file contains rules that ADE doesn't like.)
And should you encounter a commercial epub3 book without an NCX file, you can easily add one with Sigil (Tools > Epub3 Tools > Generate NCX from Nav).