The OPF eBook file formatThe OPF file extension short for the Open Packaging Format. This is a standard type of file and is part of the EPUB e-book process. The OPF file stores a lot of information about the specific e-book. This includes information like the ID # of the book, language, creator and the title of the e-book. The OPF files are stored in the format of XML and they are part of the EPUB archive for the e-book. In order for the OPF file to function, it also needs a separate NCX XML file. This separate file contains the Table of Contents for the e-book.

I wish to add this 'OPF' book to Calibre and convert it to EPUB. Lego marvel superheroes 2 pc download. I have tried 'opening several of the non-HTML files with Calibre but end up with an 'unknown' that is not viewable using Calibre. I can look at each HTML file individually with a web browser of course.

Technical details of OPF filesThe specific purpose of an OPF file is to hold information that is related to an e-book. This includes basic information about the title, language and creator of the e-book and it is kept in an XML format. In more technical terms, there are four different elements that are a part of each OPF file. These include: the guide, spine, metadata and manifest.The Metadata element contains all of the essential metadata. The Manifest element shows all of the individual files that are part of the larger package. The Spine element is responsible for keeping the linear reading order.

The Guide element is optional and includes the structural components of the e-book. More information about the OPF file format File extension.opfFile categoryExample file(1.35 KiB)Associated programsAdobe Digital Editions (Windows & MAC)Adobe InDesign CC (Windows & MAC)Calibre (Windows, MAC & Linux)KDE Okular (Windows, MAC & Linux)Geometer Plus FBReader (Windows, MAC & Linux)Useful linksDeveloperIDPF.