Custom res in Risen 2: Dark Waters

[auronn25]

Hey! Got a problem with Risen 2!
Trying to change the res to 1024x600 (it's not in settings) by rewriting the file "ConfigUser.ini" inside Appdata/Local/Risen2.
Every time I rewrite correct sequences and save the file, I start the game and it returns to defualt res (1366x768 in my case).
I was changing res in Risen 1 the same way and it worked. Am I doing sth wrong? Please help! I'd like to play in 16:9 and the resolutions higher than 1024x600 makes me low FPS in this game.
Waiting for fast and good advice! :)