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jhowell · 03-05-2023, 09:09 PM

It looks like you have added an unusable file to calibre. Calibre expects the file extension .md to be in Markdown format but Kindle for PC uses that extension to hold metadata for books in KFX format.

If you are trying to add books downloaded using Kindle for PC it only works for specific older versions of that app and only for books published prior to this year. See this thread for more information.

03-05-2023, 09:09 PM	#2
jhowell Grand Sorcerer Posts: 7,078 Karma: 91577715 Join Date: Nov 2011 Location: Charlottesville, VA Device: Kindles	It looks like you have added an unusable file to calibre. Calibre expects the file extension .md to be in Markdown format but Kindle for PC uses that extension to hold metadata for books in KFX format. If you are trying to add books downloaded using Kindle for PC it only works for specific older versions of that app and only for books published prior to this year. See this thread for more information.