The only function is to see the progres of a diferent city. Copy the file to Images/races. You can change the ILB in editor/races, chose one for example halflings and choose the giant near botton of the racial stats and after save open the map editor and put a halfling city. You can modify its size and buildings to see how the city change.
But it´s not a final version, I know that isn´t very good, I put here for a Merkraad request.