With a text Editor open RTS_CFG.h and locate this string of text. This only works in single player missions. Now in the game change the difficulty to hard or easy and your ships won't take any damage. You may have to change its properties from read-only to normal first. Open RTS_CFG.h in a text editor such as Word or Wordpad. No damage to your ships in one player mode.
Open ART_CFG.h in notepad and change the line int GIVE_ALL_MISSIONS = 0 to int GIVE_ALL_MISSIONS = 1
