Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .efx

1 extension(s) and 0 alias(es) in our database

Below, you can find answers to the following questions:

  • What is the .efx file?
  • Which program can create the .efx file?
  • Where can you find a description of the .efx format?
  • What can convert .efx files to a different format?
  • Which MIME-type is associated with the .efx extension?
eFax Document .efx file icon

eFax Document

EFX file is an eFax Document. eFax is a service of j2 Global Communications that allows users to receive and send fax documents in digital format (e.g., in email).
Category: Document files
Application: eFax Messenger
Program name: -
Mime-type: image/efax
Magic bytes (HEX): -
Magic string (ASCII): -
ef3, efax
Related extensions:
G3 FAX Image
FlashPix Image
Tag Image File Format
Microsoft Fax Image
Ability Photopaint Image
Red Storm Bitmap Image
Canon Navigator Fax
WinFax Document
TIFF Separator Page

Other types of files may also use the .efx file extension. If you have helpful information about .efx extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

CorelDRAW Corel Chart 3D Effect Data
EasyGrapher Document
Wizard FrameShop Project Archive
eFiler Configuration
RealFlight Archive
EccoPro Corrupted Database
EXIF Metadata
Softdesk Drafix CAD Document
CA ERwin Diagram

The .efx filename extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

exf (1), 3fx (1), evx (1), erx (1), efz (1), efd (1), efa (1), sfx (1), eex (1), fx (1), ecx (1), fex (1), dfx (1), ex (1), etx (1)

Can't open a .efx file?

If you want to open a .efx file on your computer, you just need to have the appropriate program installed. If the .efx association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.efx

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012/2016, Windows 7, Windows 8, Windows 10, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android

Rate this page

4 / 5 based on 39 user ratings.