AZW3 is a KF8, but a KF8 can also come in an .azw. So, try renaming to .azw and see if that helps. Note that you will likely need the latest 3rd party DRM stripping plugins (if you strip DRM). Explicit support for the AZW3 filename extension will be in the next release of Calibre (which already supports KF8 for import).
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