I don't have a conquest.ini file so I did a file search for files containing keepres and got a readme.txt as the only response.
extract
Ini file tweaks: The first time Civilization III is run, it will create a file called 'civilization3.ini'. The following lines can be added and allow you to tweak the game:
*KeepRes=1 - When set to 1, your desktop resolution will be what the game uses. 1024x768 screens will be centered, but you will be able to see much more of the map on one screen.
I suspect that this depends on which version you are playing, mine is V1.29f