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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
AFS3 - Extension Details
Date Added: January 01, 1970
File Extension:  .AFS3
Description 1: .AFS3 file extension is linked with AFS 3 Basic Encrypted File. It is the file extension utilized by Advanced File Security Basic a freeware application which reliably and securely protects various types of data against illegal access. It can be used with various types of storage devices such as DVD/CD, hard disk drives, diskettes, USB flash drives and many others. It can also be utilized for secure data transfers via email. .AFS3 file extension and Advanced File Security Basic are owned and developed by Osborn Software.
File Type:   Encoded and Encrypted File
Mode: ASCII
Program(s) to Open:  Windows: Advanced File Security Basic
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