You play a patched Conquerors version. With all patches the snow on the minimap is green.
Beta Patch 1.0A from the 'beta patch readme.txt'
PLAY BALANCE & ADJUSTMENTS
Open ground is always green on the minimap, even on snow or sand terrain.
Patch 1.0B from the 'ReadmeX_a.rtf'
C. Enhancements
Open ground is always green on the mini map, even on snow or sand terrain.
Patch 1.0c has only small changes compared to 1.0B but the same ReadmeX_a.rtf
To get the snow back you need the unpatched original version 1.0. There is a bug if you uninstall not completely and reinstall. The work around, create a new folder in /Microsoft Games, name it ‘patched version’. Cut and paste your Age of Empires II into the new folder(game not running). Install Age of Kings and The Conquerors . The snow on the mini map is back. Create a new folder in /Microsoft Games, name it ‘original version’ and cut and paste the original Age of Empires II into that folder. Just make sure that the game does not run when you switch versions.
[This message has been edited by Tanneur99 (edited 08-03-2008 @ 04:51 PM).]