Convert ebook From azw3 to txtz

AZW3 file is an eBook created in the Kindle Format 8 (KF8), Amazon's successor to the .AZW format. It supports newer features such as HTML5 and CSS3 support as well as many other formatting capabilities. AZW3 files often include DRM protection and are used as the download format for many Amazon eBooks. Information from <a href='https://fileinfo.com'>FileInfo - The File Extensions Database</a>.