DEM File Extension

Video Game Demo Format

File Type dem
Developer Valve
Popularity
4.4 (36 votes)
Application HeXen 2
Category Game Files
Format Binary

What is a DEM file?

Files with the DEM extension are specifically tied to Video Game Demo Format, a Game Files type, and there are 1265 files in this category.

The Video Game Demo Format (DEM) was created by Valve, a company that developed file format and produced 14 programs for their use.

DEM files are supported by Linux, Windows and Mac OS. If you need to play a DEM file, you can use one of 7 programs, such as Dota 2, DotA (Defense of the Ancients) and HeXen 2.

Windows

Mac OS

Linux

How to open a DEM file?

If you’re having difficulty opening a DEM file, it is often due to not having the correct software. To solve the problem, choose a compatible program from the list. Then follow the link to the official developer site, download the software, and install it on your device.

Dota 2, DotA (Defense of the Ancients) and HeXen 2 stand out as the preferred programs to manage DEM files effectively. To install the latest version of HeXen 2 on your computer, visit the Raven website where you can download the version available for all operating systems.

After installation, your operating system should automatically open DEM files with HeXen 2.

Set HeXen 2 as the default DEM handler

Choose an app to open a file on Mac

Right click or use Control + left click on the desired DEM file to launch the file options menu;
Choose "Open in Application" and click "Other";
Next, at the bottom of the window, you will see the "Enable" menu, in which "Recommended Programs" is selected by default;
In this menu, select "All Programs", then find HeXen 2 and check the box next to "Always open in the application."

Set default programs for Windows

Start by right-clicking on your DEM file, then select "Open With" and continue by clicking "Choose another app" from the options provided;
In the pop-up window, find and select the HeXen 2 application from the available options;
Make sure the "Always use this app" checkbox is checked and click "OK" to confirm your choice as the default app for opening DEM files.

Effective solutions for DEM file problems

There are some common issues with DEM files that can be resolved easily by making minor adjustments to your software. Below, you’ll find these issues along with practical troubleshooting tips.

What are the methods to detect if my DEM file has been corrupted?

DEM game files that have become corrupted may display one or more of the following symptoms:

An unexplained increase in the size of the DEM file;
Trying to work with the archive in HeXen 2 or other programs causes instability or program crashes;
The file does not open correctly or displays error messages;
While working with the file, error alerts are encountered;

Why does HeXen 2 crash?

Insufficient software updates can contribute to HeXen 2 crash. To avoid this, make sure that you have installed the latest updates for Raven products.

Restarting your computer can resolve numerous common problems, so it should be the initial step before changing any software-related settings.

How to repair a corrupted DEM file?

Open the damaged DEM file in a recovery program and select the "Repair" menu item to start the repair operation. Please wait patiently for the recovery process to finish as it will automatically repair the damaged game files.

Convert files to and from DEM

If you have trouble working with a DEM file, try converting it to AVI, SHP or similar game files.

Be aware that converting a DEM file may reduce some features, but you can usually revert it to the original format.