A fix for the missing land reflections in Far Cry 1 on any OS newer than Windows XP has been found.

http://steamcommunity.com/sharedfiles/filedetails/?id=688859773

You can get the necessary files here:
https://www.vogons.org/viewtopic.php?f=8&p=499278#p499143

Kills your performance though. Even on an i7 with GTX 660 it goes under 60 fps :(

I just posted @ Vogons about this. New here so go easy one me. If GOG are selling this game then should they not have fixed these kind of shader errors ? I know it's not always easy. Original creator of game has to want to fix it, availablity of iriginal source code, etc, etc. But I'd willingly part with a few credits to have that fixed. Otherwise I could live with, but playing the game in it's full original form seems to be the point.