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Has anyone come across files from Amazon with an "apf" extension?
I have some information that this may be a new file type that contains a zipped kfx book along with instructions for unpacking it. When sideloaded, the contents will be extracted and the files placed into the proper locations for the book to function and then the original file will be deleted.
Support for this in future Kindle firmware would allow the "Download & transfer via USB" function of "Manage Your Content and Devices" to deliver books in kfx format instead of azw3.
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