Quote:
Originally Posted by JSWolf
When you download an eBook direct from Amazon, it comes with a .azw extension be it a Mobi or KF8 format eBook. Once you load it to your Calibre library, Calibre will see what format it is and rename it appropriately. Most eBooks will be in KF8 (AZW3).
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Unless you pick an ancient Kindle as target, then it's KF7.
It used to be that the extension was azw on download for USB. Seems to be all azw3 extension since February 2021, some older ones are azw4 without human sensible filenames.
No .mobi from Amazon and the azw can be mobi(KF7) or KF8 before Feb 2021.