Quote:
Originally Posted by jhowell
That sounds like the expected behavior if you are using Kindle for PC to download your books. That program always uses .azw as the file extension regardless of the actual book format. When you import into calibre the actual format is detected and the extension is changed to reflect that.
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I transfer the e-book to my laptop, after which I sideload the de-DRMed, new azw3 book to my PW4. I don't involve Kindle for PC, AFAIK.