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ArmA 3 Terrain Builder, ArmA 3 Terrain Builder Support Forum
Where is Terrain Builder Log File located? Log file is in <SteamRoot>\SteamApps\common\Arma 3 Tools\TerrainBuilder\Logs\
dir.
Remember to delete logs from time to time, (if?) you are never going to check them out so all they do is take HDD/SSD space.