Water Battle Defense
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.

Dos edits
First, open your Earth 2140 starting batch file (earth800.bat or earth640.bat). It should look something like

if not exist vxdldr.exe goto DOS
start /m vxdldr.exe
:DOS
dos4gw game.exe x800

then add on MM MD MS WW MW
after the x800 so your file looks something like

if not exist vxdldr.exe goto DOS
start /m vxdldr.exe
:DOS
dos4gw game.exe x800 MM MD MS WW MW

run the game using the batch file you modified
and while in a mission, type one of the following

RTHSHOWMP - shows the full map
RTHRNFRCMNT - allows you to call for more reinforcements
RTHMN4 - 4x amount of money from crate*
RTHMN2 - 2x amount of money from crate*
RTHCSHLL - unsure, experiment to find out...
RTNSRCHE - ditto...
RTHRSRCHLL - research all
RTHPVR - makes T100s and ST01Bs invincible to bullets
RTHFLL- unsure...
RTHVCTR - victory