Amazon eBook Files Extensions - What are amazoneBook files and how do I open a amazoneBook file? | OpenTheFile

What are amazoneBook files and how do I open a amazoneBook file?

File Type Category File Format
.apnx Amazon eBook Files Amazon Page Number Index File
.azw3 Amazon eBook Files Amazon KF8 eBook File
.azw4 Amazon eBook Files Amazon Print Replica eBook