Mon Mar 26, 2007 6:35 pm by FriendlyFire
Some systems are very tightly linked with the game. New York (Li01), Freeport 7 and others such as the story systems (StXX) are rather important and can make the game crash. Instead of deleting all those systems, I'd just suggest to put them in a far off place on the map and make them "visit = 128". If you remove all links to the system, it'll be just as if it wasn't there.
If you truly want to remove all the systems, you'll have to hunt for all references of those systems. Check the Market files, the Story files, the Nebula and Asteroids folders mainly. Any reference to a system in those will give out errors or crashes.