You can change the settings in the savegame SAVEx.GAM
 
 Offset Contents
 
 00-05  names of the planets
                                        
 14     material A
 15     material B
 16     Material C where 00 = not present, 01 = present
 1F     planet status where 63 = free, 00 = player is owner
        01 = computer is owner
 21     base
 23     depot
 24     powerplant
 25     production
 26     mine
 28     dock