If you are using plugins like Pirate Guild or Yaki Armada which are using ADS to handle NPC ships, you will need to disable them first. It's usually done in your Artificial Life setting menu ( [Esc] / General / Artifical Life). After that:
(1) The default path is something like Program Files\Egosoft\3X Terran Conflict. It's different for Steam. But i'm sure you can find by yourself with the help of a mighty search engine.