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From my testing so far it appears that the kfx files that provide enhanced typesetting are only delivered directly to a kindle (cannot be downloaded from amazon.com for USB sideloading), have a structure significantly different from any previous kindle format, and have DRM encryption even for supposedly DRM-free books.
ETA: You can still download a DRM-free AZW/AZW3 format book for sideloading, but then you lose out on the enhanced typesetting features.
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