Thread: metadata.opf & AZW3
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Old 01-14-2023, 06:15 PM   #2
jhowell
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Posts: 7,096
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Calibre’s editor and the KindleUnpack plugin both attempt to produce an OPF that meets EPUB standards from Kindle formats that are actually structured much differently.

For what Amazon actually uses see https://wiki.mobileread.com/wiki/MOBI#EXTH_Header
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