Originally Posted by avid-e-reader
What about .ncx files? Seems mobiunpack doesn't generate one, even if one was using during creation of the book?
A good point. And that data must be in there somewhere, as it can be used to navigate in a Kindle file.
All that's necessary is for someone to spend the time to work out where and in what format it's stored, document that, and then for someone to take that info and write code to decode the info and create an ncx file from it.