Should I install DirectX 9.0(c) on my Windows 7 RTM machine?

I've just installed a new game on my Windows 7 RTM machine. The game is asking me to install DirectX 9.0(c). I said 'NO' because my machine has DirectX 11 (confirmed with dxdiag). When I run the game, an error occurs informing me that d3dx9_39.dll is missing.

Is Windows 7 DirectX backwards-compatible?

Answer

Yes.

The Direct X installer is smart enough to just pop files there for stuff to work. Some programs go about things the wrong way (as is the case here) and ask for files directly, rather than the functionality the files provide.

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