OPF stands for Open Packaging Format, which is an EPUB eBook specification.
The OPF file stores data on the ebook, such as the title of the book, the language in which it was written, its author and the any other contributors. These files are often used in conjunction with EPUB archives, to store metadata on the book.
.opf File Extension
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IDPF
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Vad är en opf-fil & hur man öppnar den - Open Packaging Format File
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IDPF