Programs enabling conversion of the file:
If your objective is to convert the file from AZW3 to the file EPUB, you can use any of the applications listed. AZW3 to EPUB conversion process in every program intended for this purpose (so-called converters) is very intuitive and everyone is able to manage converting a file.
However, bear in mind that the list may also include programs to support and work with the indicated extensions AZW3 and EPUB - and not only converters. In such a case, you need to open the source file AZW3 and from the options available in the program, choose ”Save as... EPUB" or "Export to EPUB".