Make backup copy of, then replace "empires.dat" in AoE folder "data" for AoE and
"data2" for RoR
(usually located in "C:\Program Files\Microsoft Games\Age of Empires\data"
and "C:\Program Files\Microsoft Games\Age of Empires\data2")
1. Build Market
2. Research Domestication - cost is now free, only takes one second
3. Build Farms - now they yield food indefinately
Replace with original "empires.dat" files