title_body: How to download & transfer from Kindle or Amazon.com to PC
upvoted_answer: The documented way is to use the Kindle PC app and download the book inside that. The file will end up on your PC and only readable in the Kindle. The current versions download the book as a .kfx file that allows Kindle apps to do more with the data. Older versions downloaded the file as a .azw file.
  
  The USB option does need Kindle hardware. The hardware will show in the web drop down box and the file is downloaded as a .azw file to the PC.
  
  Non DRM files can be loaded inmto apps like calibre and converted to other ebook formats.