This change appears to now be in effect. Version 3.48 of the Kindle Previewer was released today with the following release notes:
Quote:
New in Kindle Previewer 3.48.0:
1) Updated eBook file conversion and preview requirements for reflowable books (in all languages except Traditional Chinese, Japanese and Russian) - https://www.kdpcommunity.com/s/artic...on-Requirement
2) Improved error messaging for Enhanced Typesetting books.
3) Kindle Previewer no longer supports opening Mobi files created from legacy versions of KindleGen or third party applications. We recommend using an EPUB file when creating a reflowable book.
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