Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .opf

Below, you can find answers to the following questions:

  • What is the .opf file?
  • Which program can create the .opf file?
  • Where can you find a description of the .opf format?
  • What can convert .opf files to a different format?
  • Which MIME-type is associated with the .opf extension?

2 extension(s) and 0 alias(es) in our database

Obsidium Project File .opf file icon

Obsidium Project File

OPF is an Obsidium Project File. Obsidium is a software protection system.
Category: Development files
Application: Obsidium
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
Open Electronic Package Ebook .opf file icon

Open Electronic Package Ebook

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 OPF is an XML-based e-book format created by E-Book Systems; it has been superseded by the EPUB electronic publication standard.
Category: Ebook files
Application: Calibre
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
Microsoft Reader E-Book Document
TCR E-book
RAR Compressed Comic Book
ZIP Compressed Comic Book
Mobipocket Reader E-Book
TK3 E-Book
TomeRaider 3 E-book
FictionBook 2 E-Book
Amazon Kindle eBook

Other types of files may also use the .opf file extension. If you have helpful information about .opf extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

Intercept Part File
F-Secure Incremental Policy File
IGOR Pro Procedure File
SOCET SET Image Point File
Transit NXT Project
Microsoft Visual Studio Workspace Options
ProWorx NXT List Module Option File
Alchemy Publisher Project
Concordance Native Viewer Database

The .opf filename extension is often given incorrectly!

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

ipf (32), ppf (21), opt (21), pof (10), opd (10), pf (6), olf (6), kpf (6), lpf (6), opr (5), opc (4), opv (4), op (4), opg (1)

Can't open a .opf file?

If you want to open a .opf file on your computer, you just need to have the appropriate program installed. If the .opf association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.opf

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 from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012, Windows 7, Windows 8, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android

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