Quote:
Originally Posted by odamizu
I've heard you can force Kindle for PC 1.19 to download books in AZW3 by removing the file “%localappdata%\Amazon\Kindle\application\renderer-test.exe”. You can also give it a new name. The next time K4PC is launched, any books already downloaded in KFX format will no longer open and will need to be removed and re-downloaded (as AZW3).
Haven't tried it myself as I'm on a Mac, and unfortunately there's no similar work around for K4Mac 
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Same result can be accomplished on Mac by closing Kindle for Mac, then opening Terminal and pasting the following:
Code:
chmod -x /Applications/Kindle.app/Contents/MacOS/renderer-test
After that, the next time you attempt to open a book previously downloaded in KFX format, you'll be prompted to right-click and do Remove From Device and download the file again. The replacement will be in the older format.
If for some reason this breaks something, you can always put things back the way they were with:
Code:
chmod +x /Applications/Kindle.app/Contents/MacOS/renderer-test