DMO file extension

Derive ("the mathematical assistant for your PC") file with a demo of math functions recognized and executed by the program.

Movienizer (movie organization software) movie database file with data about every movie, for example, actors, producers and color posters. It also keeps track of what movies are owned, loaned to others or in a wish list.

Cube 2: Sauerbraten (free first-person shooter video game) game file with a recording of a single or multiplayer session. The file contains the player movements, game events and chat log. It allows the game to replicate an exact replay of the game. Game clients may download DMO files from the host server which recorded the demo. After downloading, they can be played in local mode. DMO files do not store video data.

Duke Nukem 3D (first-person shooter game created using the Build gaming engine) file with a game recording of player actions and world events. It allows players to replay multiplayer sessions.