A daily updated filename extension database!

EFX file extension

The table below provides useful information about the .efx file extension. It answers questions such as:

  • What is the .efx file?
  • What program do I need to open a .efx file?
  • How can the .efx file be opened, edited or printed?
  • How can I convert .efx files to another format?

We hope you find this page helpful and a valuable resource!

2 extension(s) and 0 alias(es) found in database

✅ eFax Document

eFax Document .efx file icon
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
Mime-type: image/efax
Magic number: -
Magic string: -
Sample: -
EFX aliases:
ef3, efax
EFX related links:
EFX 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

Ability Photoalbum Album Data

✅ Quake 3 Arena Effects Data

Quake 3 Arena Effects Data .efx file icon
EFX file is a Quake 3 Arena Effects Data. Quake 3 Arena is a multiplayer first-person shooter video game.
EFX format description not yet available
Category: Game Data files
Application: Quake 3 Arena
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
EFX aliases:
EFX related links:
EFX related extensions:
Quake Engine Data

Quake 3 Bot Navigation Data

Quake 3 Arena Demo

Quake 3 Engine Shader File

Quake 3 Arena Skeleton Data

Quake 3 Arena Model Shell Data

Quake 3 Arena Bot AI Data

Other types of files may also use the .efx file extension.

🔄 .efx converters

The following softwares are capable of converting .efx files to other formats:


For example, using the softwares above, a .efx file can be converted into one of the following formats:

p64, lbm, pxa, afl, dng, jpe, spc, mic, 001, syj, cpt, dxf, cr2, tile, atk

🚫 The .efx file extension is often given incorrectly!

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

3fx, dfx, ebx, ecx, edx, eex, ef, efa, efc, efd, efs, efz, egx, erx, etx

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Adobe Reader Electronic Book Exchange File
EVS GZip Compressed Field Data
RoboForm Blocking Passcards File
CorelDRAW Corel Chart 3D Effect Data
Parallels Desktop Data
WebFOCUS Procedure File
Diploma Exam File
Euphoria Source Code
Wizard FrameShop Project Archive
IBM Rational Rose Compiled Script

🔴 Can't open a .efx file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .efx file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .efx file extension, write to us!

Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
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