Don't you need to choose the aspect that you want in order to unlock those 1650-style resolutions? Eg If in the resolution choice window I leave it at 4:3 I can only get up to 1600x1200 but change to 16:10 and I can get up to 1920x1200.
Note: I don't have this game (well via Steam anyway) but this is what I do for Source games.
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