Just unzip this file into the Descent directory. Start Descent as usual 
and start a new game and select Magnum Three as the mission.

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  A NEW add-on mission for registered Descent  
۲۳
             Magnum Three  v 1.0               
 This is the third mission of seven for the    
 Magnum Mines. You stopped them at Magnum Two, 
 but they escaped and are back for the hot     
 plate materials at Magnum Three. Hot plates   
 have a devistating potential; the importance   
 of gaining control of this system is great.   
 Fortunately, the resistance at this outpost   
 has been reported as "light". Of course you   
 never know...                                 
 This level is appropriate for individual,     
 Anarchy, or co-op play. Careful design and    
fully multiplayer supported and tested.        
۲۳
           Created By Brett Russell            
            (brettr@interramp.com)             
        http://www.av.qnet.com/~brettr         
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