What is a dnl file and how do I open a dnl file?
DNL is an eBook file created and used by DNAML desktop publishing software. It contains raw text, image, and navigation data stored in a compact format for efficiency. It is protected using digital rights management (DRM), and is used by publishers and authors to distribute secure eBooks.
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How to open dnl file on Wikipedia
How to open dnl file on Microsoft.com