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DirectX 8.1 - DirectX 8.0

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Hello everyone, I have a rather simple question. I installed DirectX 8.1. It changes the define of D3D_SDK_VERSION to 220. In DirectX 8.0 D3D_SDK_VERSION is 120. The question is, I compile and build a DirectX app under 8.1. When I hand the .exe out to a friend with 8.0, it doesn''t work. He gets an error with the line ... LPDIRECT3D8 pD3D = Direct3DCreate8( D3D_SDK_VERSION ); ( Output debug errors to a file to help me debug - and the error log says that line is the problem ) --- any explanation? Thought DX was supposed to be backwards compatible. Thanks in advance, David

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