Quote:
Originally Posted by apastuszak
But it's possible to have a KF8 and mobi7 inside the same .mobi files and the Kindle will use either or, depending on what it can handle?
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Technically, yes... if you or someone you know built the book using a recent version of Kindlegen/KindlePreviewer and chose to distribute the book independently of Amazon, then both the KF8 version and the fallback MOBI version will exist in the same file. Any of Amazon's devices/apps should be able to open and read that file (one version or the other). But the likelihood of Amazon delivering one of those dual-function MOBI/KF8 files to a customer is looking pretty slim. They seem to be delivering a single purpose file to customers based on what their device/app is capable of.
But regardless, calibre will still (currently) consider the ebook as being in the
MOBI format. There is no KF8 selection when choosing the input format for a conversion—only MOBI.