A daily updated filename extension database!

DEMO file extension

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

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

Table of Contents

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

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

✅ Quake 3 Arena Demo

DM3 file is an Quake 3 Arena Demo. Quake 3 Arena is a multiplayer first-person shooter video game.
DM3 format description not yet available
Category: Game Data files
Application: Quake 3 Arena
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
DM3 aliases:
dem, demo, dm_68
DM3 related links:
DM3 related extensions:
Quake Engine Data

Quake 3 Bot Navigation Data

Quake 3 Engine Shader File

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

🚫 The .demo file extension is often given incorrectly!

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

dem, deo, dmo, emo

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Delphi Edit Mask
Duke Nukem 3D Demo File
Turing DEM File
Twin TrackPlayer Music
Vflo Digital Elevation Model Data
Miranda IM Emotions
SOBEK Digital Elevation Map Data
Quake 3 Arena Demo
Creator Simulator Compiled Module
TI Derive Demo

🔴 Can't open a .demo 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 .demo 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 .demo file extension, write to us!

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