Open Packaging Format
IDPF
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File with an .OPF extension contains metadata of an electronic publication, such as: author, title, language, book’s ID, display method or read order. It is a part of the EPUB archive stored in compliance with the Open Packaging Format, in a format based on XML.

.OPF format, being a part of the EPUB specification, contains also the second file type which holds a description of the text of an e-book – NCX, also based on XML.

.acsm Adobe Content Server Message Format
.apnx Amazon Kindle Index Format
.ava AvaaBook EBook
.azw Amazon Kindle EBook Format
.azw1 Amazon Kindle Topaz E-book Format
.azw3 Amazon Kindle EBook Format
.azw4 Amazon Kindle Print Replica Ebook Format
.bkk BookBuddi EBook Format

Last updated

.mmf 04/13/2023
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