Play Any Mission

In the properties of the shortcut to Dark Reign
2, add the following in the area that says "Target":

-cmd:"gamegod.studiomode 1;sys.runcode studio"

Example:

C:\Games\dreign2\dr2.exe -cmd:"gamegod.studiomode
1;sys.runcodestudio"

Start the game and click the tools button on the
lower right of the screen. Select "load" in the menu that follows. From there you can select which campaign you want and select the mission.
Then, once it loads, click Tools, Play Mission and you can play it. Doing this you can even see the cinimatics and how they make them too.