Cheat codes:
Start the game using the command line parameter beatrix. Example, make a desktop shortcut, right click on it and change the properties to something like this. (Game Installation Directory e.g.) C:\Age of Wonders\aow.exe beatrix

Now while playing press CTRL + SHIFT + C and enter one of these codes

mana - Get 1000 mana crystals
fog - Toggle fog
explore - Toggle exploration
gold - 1000 gold
win - Win Level
lose - Lose Level
research - All Spells researched
spells - research all spells
towns - All independent towns owned
freemove - move freely
ah teer - Start with more gold & all spells