Yes. An older version of Kindle for PC. See
https://www.mobileread.com/forums/sh...7&postcount=33
And don't expect this workaround to last foreever. Amazon will likely prevent this version working in the not too distant future. If you wnat to ensure access to azw3 in the future you will need to purchase an older Kindle, preferably a Kindle Keyboard at the earliest end of the spectrum and a Paperwhite 1 at the latest.