File Extension Search

.opf File Extension

Developer: E-book Systems/IDPF
File type: Open Packaging Format File/FlipAlbum File/FlipView
You're here because you have a file that has a file extension ending in .opf. Files with the file extension .opf can only be launched by certain applications. It's possible that .opf files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .opf file?

The .opf file extension can be classified into a variety of file types. First, it can be an Open Packaging Format File or files formatted with the standard set by Open Packaging. Files with the .opf extension are more of e-book files as they mostly contain information about the e-book from the title to the author as well as other information about it. This is why these files can be opened using Adobe software. Second, it is also used for files created by the FlipAlbum software. This is software related to e-books since it is used to create digital photo albums and these .opf files refer to the photo album created using the software. .opf files contain settings of the album; its structure and image file references. These files can be viewed and shared with other people as well. The .opf file extension is also associated with FlipBook. This software is also related to e-books as it is also developed by E-book systems. However, this is more of a digital magazine wherein the files contain descriptions of the contents of a page whether these are images, texts, etc. These .opf files can be edited with any text editor because they can be formatted using the XML format.

how to open a .opf file?

Launch a .opf file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .opf file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .opf files aren't yet associated with it. In this case, when you try to open a .opf file, you can tell Windows which application is the correct one for that file. From then on, opening a  .opf file will open the correct application. Click here to fix .opf file association errors

applications that open a .opf file

Adobe Digital Editions

Adobe Digital Editions

Designed to be an eBook reader software, Adobe Digital Editions comes with basic and advanced features for a convenient reading of eBooks, e-magazines, e-newspapers and other digital writings or publications. This program is bundled with Adobe Flash and supports for PDF files and XHTML files as well as other standard file formats of eBooks. It is also built with the implementation of a proprietary scheme called Adobe Digital Experience Protection Technology (ADEPT) digital rights management that enables users to share documents and authenticating user via the Adobe ID. In addition, this software allows the viewing and locking of contents up to six different machines. A user can also download digital contents for free or with charge that can be read either online or offline. Transferring eBooks that are copy-protected from a desktop computer to another PC or other supported device, and organizing eBooks into a library are also possible with this software.


Calibre is an e-book library management software of e-books. It has multiple features that includes Library management, E-book conversion, Syncing to E-book reader devices, Downloading and Converting news into e-book format, Comprehensive e-book viewer and Content Server for online access to book collections. Library Management helps in managing e-book collection and is designed using the concept of the logical book. The E-book conversion converts and supports all major e-book formats, it can also rescale all font sizes, ensure that the output of e-books are readable and automatically creates and detects book structures. It features Syncing to e-book devices features a modular device driver design that adds support to different e-reader devices, it also supports updates of metadata on the device from metadata in the library and creates a collection on the device from tags which are described in the library. Calibre automatically gets news from Websites and RSS feeds and formats it into an e-book which is uploaded into a device that is connected. It has a built-in viewer that is capable of displaying major ebook formats and support table of contents, CSS, reference mode, bookmarks, searching, copying, printing and customizing rendering through the use of style sheets and embedded fonts.
Geometer Plus FBReader

Geometer Plus FBReader

FBReader is an open-source and free e-book reader that works on various platforms like GNU/Linux, Windows XP/Vista and FreeBSD. The first published version of FBReader was created by Nikolay Pultsin in 2005 for Sharp Zaurus. Nikolay founded Geometer Plus LLC in 2007. Linux-based mobile devices that support FBReader include: Sharp Zaurus with Qtopia-based ROMs, OpenZaurus ROM or pdaXrom, Siemens Simpad w/ Opensimpad 0.90/Opie ROM, Nokia 770/N800/N810 Internet tablets [maemo], Archos PMA430, Motorola A1200 smartphone, PepperPad 3 handheld Web computer, Motorola E680i/A780, IRex iLiad. FBReader supports formats such as ePUB [international e-publishing standard], HTML, plucker [popular Palm e-book format], FictionBook, zTxt, CHM, OEB, RTF, PalmDoc, plain text and Non-DRM’d Mobipocket [mobi]. DAISY 3 format is supported by FBReaderJ [Java Port] for Google Android. It supports multiple books in a single archive, and directly reads from zip, gzip, tar and bzip2 archives. It automatically builds library and generates contents table. It supports character and language encoding detection. It supports footnotes, hyperlinks and embedded images. It has a position indicator, full screen mode and text search. It lists last opened books, and keeps the last open book and last reading position for all opened books between runs. It has automatic hyphenations and uses Liang’s algorithm. Future plans for FBReader features are bookmarks, tables support, automatic scrolling, dictionary integration and more formats supported by the software.FBReader
E-Book Systems FlipViewer

E-Book Systems FlipViewer

Flipview is a program which is created by E-Book Systems which can view an Open E-Book Package Format (OPF) such as Web pages, magazines. Catalogs, books, photo Albums and comics. This software can also present document with multiple page in a 3D book format providing the user a real book flipping scenario. There are visual cues for the user regarding the thickness of the document; this feature is provided for the user for an easier browse especially for multiple pages. The user may also add markers for every page that is fully customized, the flipping speed may also be set, and audios or videos may also be embedded. This software runs in Window XP, Window Vista, and Windows 7. The processor would be Intel Core 2 Duo 2GHz or higher, at least 2 GB of RAM, Internet Explorer 7.0 of higher and Adobe Flash plug-in with at least version or higher.
E-Book Systems FlipAlbum

E-Book Systems FlipAlbum

FlipAlbum by E-Book system is a program that was first release in the late 90's as a naturel look and feeling of flipping pages from a real book. E-book system wanted to make a difference by organizing photos the natural way as if the user flips an album with picture in it. This software is free of charge (General Public License). The user may create a 3D animation of flipping pages and burn it into a CD, DVD or upload it directly in the Internet. For the convenience of the user, the software provides and index and Thumbnails overview that will be automatically be rendered by the software as the user edits the album. The user may also add texts, background music, hyperlinks, audio clips, and movies files. E-Book Systems FlipAlbum runs on Windows 2000, XP, Windows Vista, and Windows 7. With at least Pentium III processors, 256 MB RAM 100 MB Hard Drive space and 16-bit color for the display, 800 x 600 screen resolution.

a word of warning

Be careful not to rename the extension on .opf files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

what is a file extension?

A file extension is the set of three or four characters at the end of a filename; in this case, .opf. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.

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