Have you tried a search on this? I don't think it is easy to enable dx9 in Blitz, because it is wrapped too tight around the dx7 core. You would have to destroy the dx7 device and replace it with the dx9 device. Then, you would have to write your own entity system or run the two devices next to each other and transfer the data realtime. There are a few examples of doing this, I found this one: http://www.blitzcoder.com/cgi-bin/ubb-cgi/postdisplay.cgi?forum=Forum3&topic=001880 You could try other things, such as VB+Ms DXSDK, or XNA or C++ and Irrlicht maybe. However, it seems like Blitz3D will still work under Vista, thankfully, maybe with a little issue about transparency but nothing big.
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