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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
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OPF - Extension Details
Date Added: August 10, 2008
File Extension:  .OPF
Description 1: The FlipAlbum is what the file extension OPF is associated with. This involves digital photo albums containing a bunch of images stored in the EBook Systems FlipAlbum format. Such files feature photo borders and image thumbnails. People can view the albums as virtual photo albums, complete with 3D pageflipping type of effects.
Description 2: Digital magazines and/or other publications like FlipBook that are readable with FlipViewers are saved in the OPF or OEB Package Format. Such files are XMLformatted and include metadata describing the content as well as a list of images, pages and text that are referenced by the publication. Since .OPF files are formatted in XML, creating and editing them can be done using a basic or standard text editor.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: EBook Systems FlipViewer Macintosh: EBook Systems Mac FlipViewer
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