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• kfx - https://fileinfo.com/extension/kfx - Kindle File Format

Snippet from Wikipedia: Filename extension

A filename extension, file name extension or file extension is a suffix to the name of a computer file (for example, .txt, .mp3, .exe) that indicates a characteristic of the file contents or its intended use. A filename extension is typically delimited from the rest of the filename with a full stop (period), but in some systems it is separated with spaces.

Some file systems implement filename extensions as a feature of the file system itself and may limit the length and format of the extension (as seen in DOS), while others treat filename extensions as part of the filename without special distinction (as seen in Unix) and instead prefer to use file signatures.

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