Liberation Day

Open the file LIBDAY.INI in a texteditor (like notepad) and change the line
CHEATS=0
to
CHEATS=1
and save the file. When playing press:

[Tab]+[W] : You win the scene
[Tab]+[L] : You loose the scene
[Tab]+[D] : Resources
[Tab]+[R] : Full shield
[Tab]+[P] : Infinitive action-points
(Information from Cheat Machine)