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dx9 is a subset of dx10 so as long as the interface is there it should run fine.
Actually no. Unlike DX2-DX9, last time I talked with Microsoft they didn't plan on supporting the previous DX's inside DX10. There are some really good reasons for this, but mostly it allows for a much cleaner design.
The only OS that will support DX10 is Vista, and Vista can run both DX9 and DX10. So you'll still be able to run your DX1-9 games on Vista (3DGameStudio Included).
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