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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
PAF - Extension Details
Date Added: January 01, 1970
File Extension:  .PAF
Description 1: The .PAF extension is linked to the Portable Application Installer File. It is an installer for portable applications that are stored on USB flash drives. Any Windows PC can be used to install and run this filetype from the USB drive. PAF files include software like OpenOffice.org, 7Zip Portable and Firefox Portable, along with other programs, utilities and games. While .U3P and .PAF files share similarities, the two are based on different technology.
File Type:   Executable file
Mode: Binary
Program(s) to Open:  Windows: run from USB flash drive
Common:
Extension: