I find only one mention of Topaz on Wikipedia
Quote:
Format support by device
Main article: Kindle File Format
The first Kindle could read unprotected Mobipocket files (MOBI, PRC), plain text files (TXT), Topaz format books (TPZ) and Amazon's AZW format.
The Kindle 2 added native PDF capability with the version 2.3 firmware upgrade.[28] The Kindle 1 could not read PDF files, but Amazon provides experimental conversion to the native AZW format,[29] with the caveat that not all PDFs may format correctly.[30] The Kindle 2 added the ability to play the Audible Enhanced (AAX) format. The Kindle 2 can also display HTML files.
The fourth and later generation Kindles, Touch, Paperwhite (all generations), Voyage and Oasis (all generations) can display AZW, AZW3, TXT, PDF, unprotected MOBI, and PRC files natively. HTML, DOC, DOCX, JPEG, GIF, PNG, and BMP are usable through Amazon's conversion service. The Keyboard, Touch, Oasis 2 & 3, Kindle 8 & 9, and Paperwhite 4 can also play Audible Enhanced (AA, AAX). All Kindle models from the Kindle Paperwhite 2 and newer can display KFX files natively. KFX is Amazon's successor to the AZW3 format.
Kindles cannot natively display EPUB files.
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https://en.wikipedia.org/wiki/Amazon...port_by_device
The K3 also supports azw3/KF8 if the firmware is updated.
The international DXG (B009) actually was released after the B008 K3, but it's simply the gen 2 DX with the screen upgraded from Vizplex to Pearl, so it never got azw3/KF8 support.