Thread: Calibre has stopped opening books with the KFX extension
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Old 07-28-2023, 09:10 AM   #4
jhowell
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Quote:
Originally Posted by Timucin View Post
I don't know what K4PC or K4Mac is.
Those are shorthand names for the Kindle fo PC and Kindle for Mac apps. They are sometimes used to download purchased Kindle books in KFX format, although those books will have DRM that can be difficult to remove.

In your case the book in question is in Arabic and those apps do not support that language so that cannot be how you obtained that book.

Quote:
Originally Posted by Timucin View Post
But these are not encrypted books anyway. I could open them before.
Calibre does not support viewing KFX format unless the optional KFX Input plugin is installed. You are mistaken about something regarding your previous setup.
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