Unfortunately there isn't a D3D option in RB,what you are selectig is Direct Draw.Direct Draw is what your desktop uses.
This is why it comes out pixelated (software mode)
The above post has some good links for you.The best way for you may be to get hold of a Voodoo2 as a pass through card.Although you could get your DD game looking like this as a last resort
Pic taken using a Geforce2 mx400 at 1024x768 windowed mode,Western Front Patch and converted PL terrain
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Brigstock [This message has been edited by Brigstock (edited 05-07-2002).]