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Old 02-07-2026, 09:08 AM   #1749
jhowell
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Posts: 7,253
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Quote:
Originally Posted by tomsem View Post
If I chose to 'combine' it creates books with goofy titles (ASIN?) that end with .azw extension and inside that are the imported book in KFX, usually. And that goofy title is used for the book file (.kfx) and another with the same name with .MD extension.
The combine option tells calibre to treat each of the files in the folder as a separate instance of the same book. Books in KFX format are composed of multiple files that together make up only one instance of the book.

The Kindle for PC app uses the file extension .md for KFX metadata files. Calibre will interpret that incorrectly as being a separate copy of the book in markdown format.

See the section "Importing from Kindle for PC" under "Importing KFX books into calibre" in the first post of the KFX Input plugin thread for information on how to ignore those .md files and make the import work better.

Quote:
Originally Posted by tomsem View Post
These .MD files are in binary format, no idea where they came from but it was not in the source folder, and .MD is supposed to be plain text.
They are there in the folder that makes up a book in KFX format along with .azw, .res, and .voucher files. Your screenshot shows that you have file extensions hidden in Windows file explorer. (That is the default unless changed.)
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