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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:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
OPX - Extension Details
Date Added: January 01, 1970
File Extension:  .OPX
Description 1: .OPX is the extension linked to the FlipAlbum Photo Album file. An OPX file is used to store a set of pictures arranged in a photo album. It also contains metadata describing the images. Locate pictures in a particular album with the help of .OPX files. In some cases, different FlipAlbum versions can be used to open OPX files by simply switching ".OPF for the ".OPX extension.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: EBook Systems FlipAlbum
Common:
Extension: