File Extension OPF

  • Full name
    Open Packaging Format
  • Developer
  • Popularity
Have you encountered a problem with a OPF file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a OPF file here. In the further part of this page we have added a list of programs that should open your OPF file. It is enough you choose a proper application for your operating system, download and install it.


OPF files are XML-based files in the Open Packaging Format Standard. The OPF standard is part of the EPUB specification and stores metadata such as title, language, categories and author of an ebook. In addition, images and the navigation structure are referenced in an OPF file.

An EPUB publication usually contains a file called Content.Opf and an associated toc.Ncx file with the table of contents. The actual content pages are html files without which an OPF file can not be meaningfully used.

Programs which can open a OPF file

How to open a OPF file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the OPF file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a OPF file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support OPF files. At this point we are looking for disk space where the application was installed in and we can link it with a OPF file. Since then, our operating system will use the selected program to support all OPF files.

Other issues

Despite the described problem with OPF there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the OPF file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the OPF file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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