Morgomir12: that is for the original version of Earth 2140 and isn't even applicable to the GoG version as those files don't exist in the new version
Open dosboxE2140_single.conf with notepad and edit the line "game x800" to be "game x800 WD MW MS KR WW" and save, when in the game, type code(need to be cap) and effect as below
RTHKILL - Destroy All Selected Units
RTHHEALTH - Heal All Your Selected Units or Enemy Structure
RTHSHOWMP - Reveal Mission Area
RTHCSHE - $5000 to All Teams
RTHMN4 - 4 Times Income Per Crate From the Mines
RTHMN2 - 2 Times Income Per Crate From the Mines
RTHRNFRCMNT - Allows Another Call for Help
RTHVCTR - Complete Mission
RTHRSRCHE - Up One Research Level for All Teams
RTHRSRCHLL - Complete All Levels of Research for All Teams
RTHPVR - Max Strength to Armor and Firepower for T100 and ST01B
RTHGLX## - Jump to Level ##
personal test verified, enjoy!