Quote:
Originally Posted by mattmc
At the risk of being nitpicky, AZK is not, to my knowledge, delivered by Amazon. It's an intermediate file format that Kindle Previewer produces, using a piece of software called azkcreator. When you load it into K4iOS, the app converts it into a .KCR file, which I believe stands for "kindle cloud reader". (I suppose that format is what's used for Amazon's browser-based reader of the same name.)
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To be precise, in the case I was describing Amazon delivers a set of JSON files that have the same format as the contents of an AZK file. I hadn't made the connection before, but it does look like the contents of an AZK file are the same type of JSON files that the cloud reader app uses. I guess it was easier for Amazon to put their cloud reader web app into the Kindle for iOS app than to implement full KF8 support there. That could be the explanation for the existence of AZK.
(That still leaves of question of why KFX was created. I doubt that it was done just to introduce some typographic enhancements.)