>> OPF file

OPF file format description

Many people share .opf files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .opf file can be edited, converted or printed with. On this page, we try to provide assistance for handling .opf files.

2 filename extension(s) found in our database.

.opf - Obsidium Project File

The OPF development files are related to Obsidium. OPF is an Obsidium Project File. Obsidium is a software protection system.

Development files
- / -
Obsidium Project File related extensions:
CodeWarrior xSYM File
Nvidia Vertex Shader Profile
NuGet Specification Data
NuGet Package
Portable Translation Memories
Novell Localisation Workbench Workspace

.opf - Open Electronic Package Ebook

The OPF ebook files are related to Calibre. OPF file is an Open Electronic Package Ebook. OPF is an XML-based e-book format created by E-Book Systems; it has been superseded by the EPUB electronic publication standard.

Ebook files
- / -
Open Electronic Package Ebook related extensions:
Calibre Device Information Data
Comic Book Collection
Zipped HTML eBook
Sony BBeB E-Book
Sony BBeB E-Book Source
EPUB Navigation Control XML

Naturally, other applications may also use the .opf file extension. Even harmful programs can create .opf files. Be especially cautious with .opf files coming from an unknown source!

Can't open a .opf file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .opf file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

ipf, kpf, lpf, ofp, olf, oof, op, opb, opc, opd, ope, opg, opr, opt, opv

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Intercept Part File
OpenG Package File
Objecteering Project
F-Secure Incremental Policy File
Alchemy Publisher Project
OpenPanorama Visit File

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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If you have useful information about the .opf file format, then write to us!

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