The original game may not natively support modern 1080p or 4K monitors. Check the game's options menu to adjust the resolution, or modify the configuration .ini file in the game directory to match your monitor's native aspect ratio.
While the game is still technically owned by GSC Game World (the developers of the S.T.A.L.K.E.R. series), the original 2001-2002 version is rarely sold separately today. cossacks art of war pc game free download dire portable