Specifies if an alternate image should be loaded for the object based on the map's theater. If this is set, the game will discard the SHP extension of the filename and use the same extension this theater's terrain tiles use. Correspondingly, the file it uses is not necessarily the standard tem file, such as the original tree##.tem. The characters used for each theater can be found on the Theaters page.
Specifies which theater this map should use. Technically, this allows you to change the theater of the map at will, for example from a snow map to a temperate map, without otherwise editing the map or creating a whole new map. However, most theaters are more or less un-interchangeable because their tilesets are ordered differently. Therefore, changing the map theater may result in graphical errors.