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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
EFX - Extension Details
Date Added: May 10, 2008
File Extension:  .EFX
Description 1: .EFX file extension is linked with Ensoniq Instrument File. This is the file extension for the individual instrument files utilized by Ensoniq. .EFX file extension is also associated with Awave Studio by FMJSoftware a multipurpose audio/sound tool which reads audiocarrying file formats from various platforms, trackers, synthesizers, mobile phones and others.
Description 2: .EFX file extension is linked with Everex eFax Document. .EFX files are compact version of the fax files that can be read using free eFax Messenger program. eFax can deliver fax documents in three formats and it uses a local or tollfree number which is linked to the users email. You can send and receive faxes as email attachments as well. .EFX file extension and eFax are owned and developed by Global Communications Inc.
File Type:   Document File
Mode: Binary
Program(s) to Open:  Windows & Mac: Global Communications eFax
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