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Redistributable
This download provides the DirectX end-user multi-languaged redistributable that developers can include with their product. The redistributable license agreement covers the terms under which developers may use the Redistributable. For full details please review the DirectX SDK EULA.txt and DirectX Redist.txt files located in the license directory.
This package is localized into Chinese (Simplified), Chinese (Traditional), Czech, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese (Brazil), Russian, Spanish, Swedish, and English.
End-User Runtime
Microsoft DirectX is a group of technologies designed to make Windows-based computers an ideal platform for running and displaying applications rich in multimedia elements such as full-color graphics, video, 3D animation, and rich audio. DirectX includes security and performance updates, along with many new features across all technologies, which can be accessed by applications using the DirectX APIs.
This download provides the DirectX end-user multi-languaged redistributable that developers can include with their product. The redistributable license agreement covers the terms under which developers may use the Redistributable. For full details please review the DirectX SDK EULA.txt and DirectX Redist.txt files located in the license directory.
This package is localized into Chinese (Simplified), Chinese (Traditional), Czech, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese (Brazil), Russian, Spanish, Swedish, and English.
End-User Runtime
Microsoft DirectX is a group of technologies designed to make Windows-based computers an ideal platform for running and displaying applications rich in multimedia elements such as full-color graphics, video, 3D animation, and rich audio. DirectX includes security and performance updates, along with many new features across all technologies, which can be accessed by applications using the DirectX APIs.

WTF?.
Why not call it DX9d or dx9.1?
WTF?.
Why not call it DX9d or dx9.1?
System requirements for redist shows it supports Vista. As we know vista is dx10, so it couldn't be called dx9.
Why does system requirements for end-user not show vista support?
WTF?.
Why not call it DX9d or dx9.1?
Becasue it's still 9.0c, that's why. This is just a minor update. There's a few updated DLLs, some updated XMLs and not much else. You probably don't need it unless you have a game that requires it, but it doesn't hurt anything to update your system anyways.
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