Quote:
Originally Posted by Luffy
Fair enough. I always transfer the azw (and the file has always been of that extension without fail) via computer, after which I remove the DRM and sideload the now azw3 file through USB cable to my PW4.
To repeat, I get the azw extension every single time I buy a book from amazon.
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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.