That's the only place you should download registry fixes for Blizzard games anyway...
That registry file was based off of other online registry fixes for old games. Anyways, the registry fix provided by Blizzard simply doesn't work for many people. There are multiple causes for the color issue and I already posted a guide in this topic on how to get rid of the color problem.
email@example.com -email me if you need tech support
Sorry but I no longer offer tech support for Diablo and Diablo 2 because I know the answer to your question already, THERE IS NO COW LEVEL!!!