Is it possible or not ? How ?
No, it is not possible. This is an old game, it has a (more or less) static UI which only supports the three resolutions selectable in-game. Moreover it is 4:3 (or 5:4 for 1280x1024). To support different aspect ratios and larger resolutions, would require major re-working and modding. Not worth it (IMO) even if it was possible.
Just let your monitor scale it the way you like it to your monitor.