Just to clarify better, alter the following configuration files like so to enable alternate resolutions than 800x600 in openSUSE 12.3 as a guest under Windows 8 pro Hyper-V:
As it turns out, you do not need to alter the /etc/X11/xorg.conf.d/50-screen.conf - just the first fix will work for 50-device.conf will work fine. Thanks again, everyone!