QUOTE(BroodKiller @ Nov 14 2005, 04:26 AM)
The "Attack Ground" option is located in the Targeting Flags parts of weapons.dat. Precisely - it is the 0x40 flag that is responsible for this. However, this works only for certain spells, so youąd have to experiment a bit...
Actually it works for regular attacks as well (see infested terrans suicide)
EDIT: nevermind...the infested terran doesnt have 0x40 checked even though it can attack ground so they probably made it a hardcoded exception