The Open Packaging Format or OPF file extension is a typical file format that stores data regarding the specific e-book. The stored data can include the identity of the book, creator’s name, language, and the title of the e-book. All the OPF files are coded in XML. These files are a part of EPUB achieve. Opening an .OPF file would not be possible without a separate NCX XML file. That additional file stores the table of the content for the specific e-book and that’s why NCX XML file is needed to open the OPF files. The main purpose of creating OPF files is storing all the details regarding the e-books.
When you install one of the applications from the list of programs that you found here, you should be able to open or edit the file with the OPF extension without any issue. However, if you still have problems with this, you may use the option of OPF file conversion to a different format.
We hope we helped you solve the problem with the OPF file. If you do not know where you can download the application from our list, click on the link (which is the name of the program) - you will find more information there on the location where to download the secure setup version of the required application.
There can be more reasons which determine that you are not able to open the OPF file (apart from the lack of the proper application installed).
First - the OPF file may be incorrectly associated with the application installed to support it. In this case, you need to change this association by yourself. To do this, right-click on the OPF file that you want to edit, click "Open with" and then select the program from the list that you have installed. After this operation, the problems with opening the OPF file should be solved.
Second - the file you want to open can simply be damaged. Then, the best solution is to find a new version of given file, or download it again from the same source as before (maybe for some reason in the previous session the download of the OPF file has not been completed and it cannot be opened properly).
If you have additional information about the OPF file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on OPF file.