[Ragnarok]

"mmmm... when I create an new race, a .emp file is created. But all the provided infos (description, demeanor...) are written in this file, not in a .txt file in the pictures/race directory like default game races ?"
That is correct.

"And also :

default races have 2000 race points. how can I create 3000 and 5000^points races?"

To do this, go to "Player Settings" when you're starting a new game. (This screen has how many starting planets ans such on it) Then on the bottom box it says; "Racial points for new players." The default is "Low (2000)" just change that to Medium (3000) or High (5000). That should do it. Hope it helps.