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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
DAX - Extension Details
Date Added: January 01, 1970
File Extension:  .DAX
Description 1: .DAX file extension is linked with PSP Compressed ISO Disc Image the image format used by Sony PSP. This file contains a 'data dump' from the PSP UMD disc which is in a form of a compressed .ISO file. .DAX file extension can be opened using UMDGen or other disc imaging utility. PSP's game data may also be dumped into a compressed ISO or .CSO file that is similar to DAX disc imaging file format. .DAX file extension and PSP are owned and developed by Sony.
File Type:   Archive/ compressed file
Mode: Binary
Program(s) to Open:  Windows: CiSO, PSP ISO Compressor, UMDGen, YACC
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