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If you've been having problems playing Gabriel Knight 3 under modern 64-bit osses, dgvoodoo2 wrapper might be the help you've been asking for. Only thing you need to do is to unzip the wrapper to your game directory, in the case of GK being a DirrectX game the contents of the MS folder with the wrapper setup file.

You don't even have to do any alterations to the wrapper setup, but if you are experiencing issues, you can make change displaycard type and functions through the setup. Personally I got rid off most of the crashes and even the cinematics are now working correctly.

The wrapper should also work with other older 3D games that have problems working under modern OS's.
Thanks, this is already known: :)

Unfortunately though, higher resolutions than 1024x768 will break the Sidney screen.