Quote:
Originally Posted by salamanderjuice
It is, but AZW3 has been somewhat spread outside Amazon and arguably obsolete like Mobi. For example Standard Ebooks provides AZW3 downloads. You could use an Amazon provided tool like Kindlegen to make AZW3 too. I don't think Amazon provides anything like that for KFX besides Send to Kindle.
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I'm not sure I have ever come across AZW or AZW3 outside of Amazon and Amazon tools.
But admittedly I don't use that many other sites or sources, aside from Kobo and Smashwords and Project Gutenberg (and related) and BookFunnel and sometimes direct from an author's website. Some sites don't deal with AUS.
Most of those, if they provide a download for the Kindle, offer an ebook.kindle.epub type of file. You can see that most easily at Project Gutenberg which usually has an image and noimages variant as well.