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Sadly, Calibre doesn’t handle .kfx at this time.
There’s a plugin, and easy tutorials to follow online. It absolutely handles KFX.
It absolutely does. https://plugins.calibre-ebook.com/ there is a KFX input plugin. Also, if using an older version of kindle for PC you can batch download your whole library and import to Calibre.
Yep, I did it earlier today. Took about half an hour to set up, download and convert 75 books and comics