it did not work.
Does that mean this?
a little play window in the corner
Strange enough that the launcher crashes, but this looks as if it does not read your config file. Are any changes applied you make there? Be sure to close your client before saving the config, as it will get overwritten automatically. What happens if you play in windowed mode, setting fullscreen to 0? Will the window have the desired resolution (size)? And yes, your aspect ratio is 16:9.