Duokan installs alongside the typical Kindle OS, so you can dual boot to it whenever you want (such as to read the Kindle Store's DRM -
protected AZW files, or to use free 3G Whispernet).
Not exact matches
azw, but the only way to use it for its main purpose — as a digital reader for popular mainstream books — is via its own proprietary DRM -
protected format.
AZW supports DRM (unfortunately) and is built around the Mobipocket format — though, confusingly, DRM -
protected Mobipocket files can not be read on the Kindle, because they're not exactly one and the same.