.AZW1 File

The azw1 file extension mostly known to be used for a proprietary format used by Amazon Kindle called Topaz.

It is a completely different format from AZW. It is often used on older books that are scanned pages. It uses a different compression method than standard MOBI format and it inherently has embedded fonts in the file allowing more complex display using font sets and characters that are not standard to Kindle.

Typically used for ebooks delivered via Whispernet (a cell-phone data service available in some models of Kindle).

Files with azw1 file extension can be found as e-books from the Amazon Kindle Topaz platform. Special e-book format, often used on Whispernet.

How to open:

Primarly use Amazon Kindle to view and read the *.azw1 files.

How to convert:

You can find ebook management programs capable of export *.azw1 e-books, such as Calibre.