[dannydav709]

I have a question, and an idea for a really nice potential feature in Calibre. If I download a book on Kindle for Mac, it is possible to see all files associated with the book in in Finder (I imagine there is a similar process for windows but I've never tried yet). One of the files is a ".apnx" file. This file gives page numbers that align perfectly with the "azw3" eBook file.

The problem is, if I then try to use KindleUnpack to extract the ePub file from the azw3, and use send-to-kindle to send the extracted ePub to my kindle, and then import the same ".apnx" associated with the original ebook into my Kindle in the folder where the sent-to-kindle ebook resides (using Finder or whatever other files app), when I open the book, the page alignment appears just a bit off (in some cases a lot more off).

I suppose it is due to the processing that Amazon does to the ePub file that was extracted from the azw3, which changes some stuff ever so slightly. I was thinking if there is a way to see how Amazon does the conversion (by comparing the original azw3 to the epub and also to the processed azw3), maybe theres a way to have the processed azw3 resemble the original azw3 (if a pattern for how Amazon does the processing can be found). That way, the "apnx" files of Amazon kindle books can work perfectly with azw3 files that are the result of Amazon's send-to-kindle processing for ePubs extracted from the original (official) azw3 files.