In case the water troops get too powerful,you should build some WTP 100 air-cushion transporters and place some SPIDER or SPIDER 2 units on them.

edit earth640.bat or earth800.bat or both.
     They should look like this:
     if not exist vxdldr.exe goto DOS
     start /m vxdldr.exe
     :DOS
     dos4gw game.exe x640
     Change it so it looks like this:
     if not exist vxdldr.exe goto DOS
     start /m vxdldr.exe
     :DOS
     dos4gw game.exe x640 WW MD MS

That process was to allow the cheats, now during the game type the following while holding down SHIFT.

RTHSHOWMP - shows the entire map (no shroud)
RTHCSHE - both sides (ED and UCS) gets $5000
RTHMN2 - double container contents (twice the income per crate from the mines)
RTHMN4 - 4 times the income per crate from the mines
RTHRNFRCMNT - allows more than one call for help! To use, type the cheat and press 'R'. Retype the cheat and do it again if you're not satisfied by the amount of help that comes.(note: on some missions this is not allowed)