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Oops, you're right. The file format is azw3, not kfx. I set up calibre so long ago I forgot that Kindle does not necessarily mean kfx. In fact, I now remember that I intentionally used an older version of Kindle for PC to get the old file format. BTW, is this restriction still in place?
Anyway, sorry if I'm in the wrong place. The name of the book is "Chess Endgame Workbook For Kids" with ASIN B07ZKDCTJJ. I've attached the conversion log; it says it's using MOBI input. Also, I seem to have developed another problem in that the conversion now hangs (status "Completed Markup Transformation") instead of running to completion.
Thanks for your help.
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