Create file "NOUGAT.LF" under your Ascendancy directoy. 
You don't need to put anything in it. During gameplay type
these letters or combinations to use cheats:

Planet      Screen
------------------
I         - Complete project
O         - Maximum population
R         - Bring colony under your control
Shift + M - Adds 1 to maximum population
T         - Create colony on a unhabited planet
N         - Advance current project one day

Research Screen:
----------------
E        - Finish current research
D        - Gain all research
C	   - Finish current project
F        - Click view controls to forget all research 
1 - 7    - Play as various species	Star map
8        - View starlanes, planets	Star map
[Alt] +E - Toggle technology stealing
L        - View all starlanes
S        - View all stars


Any Screen:
-----------

[Alt] + D - Display coordinates		
[Alt] + W - Display debug window
[Alt] + F - Display mouse movement stats
[Alt] + G - Save screen in .GIF format