When I first started the game it was widescreen and everything was fine. Than I decided to go into the options and now its 4:3 with borders. I deinstalled the game and installed again, but now it stays 4:3. There must be some kind of folder which I don't see with some files other than the installation files in my games-folder, some config file. How can I delete EVERYTHING and install again to have widescreen again?
Or how can I manually enable widescreen on settlers 3? Thanks!

There is no widescreen option for this game.