Files with dem file extension are typically found as demo files recorded by various computer games (DOTA 2, Counter Strike, Quake, Hexen, Unreal Tournament etc.).

There are 4 other file types using
the DEM file extension!

empty icon.dem - Creator Simulator temporary data

empty icon.dem - Demetra+ automated project

empty icon.dem - Digital Elevation Model map

empty icon.dem - Melco Embroidery format

DEM file extension - Source engine game demo replay

What is dem file? How to open dem files?

File type specification:

Game file type icon Game file type

File extension dem is most likely best known for its use for files created when recording matches in computer game Counter Strike (or other Half-Life clones) and DOTA, DOTA 2. These records are often shared between users and watches as replays.

DEM format is the default replay demo format used in Valve's Source engine.

The very same dem suffix was also used in old Quake/Hexen II computer game for recorded games, that could be re-played in the game. In case of multi-level record, the game saved the file with pak file extension.

Also, in some computer games like Unreal Tournament, Tom Clancy's Rainbow Six 3: Raven Shield game, or the the classic Descent, there were some files with file extension DEM, that contained demonstration of the game usually recorded within the game.

Updated: January 29, 2024

The default software associated to open dem file:

Dota 2 icon

Valve Corporation logoDota 2  Multiplatform software

Company or developer:
Valve Corporation

Dota 2 is successor of Defense of the Ancients (DotA) video game. It is a competitive game of action and strategy, played both professionally and casually by millions of passionate fans worldwide.

Players pick from a pool of over a hundred heroes, forming two teams of five players. Radiant heroes then battle their Dire counterparts to control a gorgeous fantasy landscape, waging campaigns of cunning, stealth, and outright warfare.

DotA (Defense of the Ancients) icon

DotA (Defense of the Ancients)  Multiplatform software

Company or developer:
PlayDotA.com

DotA is a competitive game of action and strategy, played both professionally and casually by millions of passionate fans worldwide. Players pick from a pool of over a hundred heroes, forming two teams of five players.

Help how to open:

Recorded games in (.dem) can usually be replayed in their respective games.

How to convert:

VirtualDub can open .dem files from Source engine (Half-Life) and save them to another video format, such as AVI.

Find conversions from dem file:

dem to avi

dem to csv

dem to mov

dem to mp4

dem to shp

List of software applications associated to the .dem file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open dem file, edit dem file, convert dem file, view dem file, play dem file etc. (if exist software for corresponding action in File-Extensions.org's database).

Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting dem files.

dem file players - programs that can play dem file - Source engine game demo replay

Programs supporting the exension dem on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for play dem file action.

Multiplatform:

Main software associated with dem file by default:
Dota 2 small icon Dota 2
DotA (Defense of the Ancients) small icon DotA (Defense of the Ancients)

Microsoft MS-DOS:

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