A game replay file made by a different first person shooting video games and on the whole by the famous Counter Strike (Valve’s Source game engine supported). It stores a video game recording from one person’s perspective in a single player or multiplayer game mode, and is utilized for showing replays to others. For playing a Counter Strike the .DEM file for is used by the Windows OS, put the file in cstrikeinstallation path. Now, start the game and open console window. Here type viewdemo demofilename, “where demofilename” is the name of the file without DEM extension.
DEM format files are moreover used by Unreal Tournament, Quake, and Hexen II. But, these files can only be played on the video game through which the demo was initially created. The DEM format files made by Source engine games like Counter Strike may be opened using VirtualDub for playing the video frame sequence and recording it to other file formats like AVI.
In addition to the problem described above, i.e. the lack of the appropriate application to support the .DEM file, there may be several reasons that cause problems with opening and operation of the data format:
A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .DEM file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .DEM file, so download the update and check again.
If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:
It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.
There may be several reasons why you cannot open the file with .DEM extension. Directly on this website you can find a solution of the most common problem with the .DEM file – that you do not have on your computer the appropriate program to open the file.