There appears to be some name confusion here. KF8 is Amazon's name for the format calibre calls AZW3 because it typically uses a .azw3 file name extension.
The Project Gutenberg file for Kindle is in KF8 format but downloads with a .mobi file extension. If you rename it to have a .azw3 extension it will work better in calibre and on Kindle devices.
This change of file extension will occur automatically upon import to calibre if you have the DeDRM plugin installed and enabled. (This happens even if the file does not contain DRM.)
Last edited by jhowell; 11-18-2022 at 06:37 AM.
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