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The .azw3 extension is for KF8 ebooks. Calibre does support these, since version 0.8.42. However, it (or perhaps 3rd party DRM-stripping plugins - make sure these are up to date if you are using them) may not recognize .azw3 as a "known" extension. If you rename to .mobi (or .azw), before import Calibre should handle it.
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