Do you have a shortcut on your desktop to the Kindle for PC program?
Right click it
Select Properties
Look at the Address in the "Target" box.
Go to that address in Windows Explorer and you will see the Kindle.exe file. That is what you will need for the next steps.
Right click on an azw3 file
Select "Change" at the top of the General tab
Scroll down and select "More Apps"
Scroll down and select "Look for another app on this PC"
Now navigate to the Kindle.exe file and select it.
That should now associate azw3 files with Kindle for PC.
|