Digging Around Amazon's Topaz File Format

Late Night Code is popping the hood on Topaz, that mysterious “other” file format used on the Kindle:

Mobipocket files purchased from Amazon have an AZW extension (which presumably stands for Amazon Whispernet – the name of the Kindle wireless download service). Mobipocket files from other sources will have a MOBI or PRC extension. Topaz files will have an AZW1 extension if downloaded directly to the Kindle, and a TPZ extension if downloaded from Your Media Library on Amazon.com.

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