Quote:
Originally Posted by RbnJrg
When we, nowadays, get a book from the service of Kindle Direct Publishing, we get a .mobi but THAT .mobi has inside a .kf8 and a .mobi7. So we can't call .mobi anymore just the old mobi format; now there are mobis that are -simultaneously- .kf8 and .mobi7.
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When I Unpacked the downloaded Kindle book file the other day, my resulting folders were named Mobi 7 and Mobi 8
In another thread, Hitch has described the latter as an "epub-with-a-mobi-wrapper". (I upload Sigil-built epubs to the Kindle Direct Publishing platform.)
Further to this distinction, the Mobi 7 files (htm, opf, and ncx) totaled about one-fourth the size of the Mobi 8 files (basically just the epub). Yet the latter is what Amazon uses to calculate the "download fee" of 15 cents per MB. The difference, on that particular book, is about 35 cents per download, that I am being overcharged for buyers with one of the older e-ink Kindles, sigh.