What is an OPF file?
OPF stands for Open Packaging Format. The Open Packaging Format is a standard that is a part of the EPUB eBook specification. The OPF files store information for an associated eBook including the title of the eBook, the eBook language, creator, reading order and book ID. The OPF file is included in the EPUB archive to specify the metadata of the associated eBook. The OPF files are saved in XML format.
Software that will open or convert OPF files
|calibre - E-book management||Download Now|
|E-book viewer||Download Now|
|Mobipocket Creator||Download Now|
|Program has been verified by File.org to open OPF files.|
|Every day, thousands of users submit information to us about which programs they use to open certain types of files. Our users primarily use the above programs to open OPF files.|
Try a universal file viewer
In addition to the products listed above, I would suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too » Free Download.