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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
EFL - Extension Details
Date Added: January 01, 1970
File Extension:  .EFL
Description 1: .EFL file extension is linked with Encryptafile Encrypted File. Encryptafile is an encryption application which uses the industrys standard encryption algorithms. Some of its features are: supports traditional and modern encryption; supports newlyadopted Advanced Encryption Standard [AES] secretkey encryption algorithm, Rijndael which utilizes 128, 192 or 256bit keys; decrypts a variety of standard encrypted files. .EFL file extension and Encryptafile are owned and developed by XenoSystems LLC.
File Type:   Encoded and Encrypted File
Mode: ASCII
Program(s) to Open:  Windows: Encryptafile
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