Don't know exactly. Maybe it's explained in the manual? BTW, I think Malfador have abandoned this game, their last statements (in July or August 2011) gave a strong indication that they have no intent to develop more updates (because they think there's no demand for them by the community). As I stated before, maybe enough people wanting updates would change their mind, but this forum simply hasn't got enough participants, and they've proven (in late 2010/early 2011) that they mostly don't regard the forums.
A better way to contact them is their E-mail adress:
ws@malfador.com