What is .DMX file extension?
Project file created by Source Filmmaker (SFM), a program used for making 3D movies and still images for use with Valve's Source game engine; saves a 3D recording created by the user and can be comprised of game map objects, models, animations, sounds, effects, and other 3D model data; often contains a recording of actual gameplay.
SFM projects are used for making short movies and cutscenes. SFM can export, or render, projects to .TGA still images or to .AVI videos.
NOTE: Source Filmmaker can only be installed using Valve's Steam client.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.