IceMan1988 has found how to play the 4x4 games in any resolution:
Originally Posted by IceMan1988
I came here searching for widescreen solution for 4x4 Hummer. From what I know - those are very similar games. I found a solution on my own and probably it works on UAZ too.
You should find file VideoSettings.scr in Data folder in your game directory. It is graphics configuration file and there you can set any resolution you want by changing Resolution(x,y) parameter, where x is of course width and y is height.
This game has very nice graphics, so changing resolution to max is IMO very recommended. Have a nice play!