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Come to think of it, this is an odd duplication if the book contains nothing that is unique to the Fire etc. I use drop-caps because I like the way they look on the newer devices, but nothing else that requires KF8. Would a plain KF7 book also be duplicated in KF8 format within the mobi file?
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Nothing is being duplicated in the files that ultimately reach the end-user. When a user purchases the book, they download either the stand-alone KF8 version of the book (if available) or the stand-alone MOBI version of the book—depending on the capabilities of their device or app. No one is downloading a file from Amazon that contains both versions. Publishers/Authors are only
uploading the combined MOBI/KF8 file (and even then... only if they built the ebook themselves with Kindlegen) to Amazon.
Again: the combo file that contains both versions of the ebook is only being used to
get both versions of the ebook to Amazon in a convenient package. The customer never gets that combo file (from Amazon anyway).