Originally Posted by Mike.nl
I'm not sure if Slocket was correct by saying patch 1.4. It could be from the map editor as well.
Anyway, look in GameData\Mods\Source\Data\Scripts.
That directory structure doesn't exist with just the 1.4 update (specifically GameData/Mods), so it must be the map editor, which I haven't got around to yet. I'll go grab that next.
Thanks for the clarification Mike!