ZONAL.DAT
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zonal.dat
contains information which zones with which priority aliens are going to attack. There are 12 zones. If a priority of a zone is zero, the zone will only get terror attacks. In editing too many zeros into the file I have often found that the game is considered lost.
offset zone priority 0 North America 18 1 Arctic 4 2 Antarctic 4 3 South America 10 4 Europe 16 5 North Africa 12 6 South Africa 8 7 Central Asia 12 8 Southeast Asia 15 9 Siberia 10 0xa Australia 10 0xb Pacific (+Rest) 5