Hi, I am a newbie to Microsoft DirectX 11 SDK. I just downloaded and installed Microsoft DirectX SDK (November 2008). While trying to execute sample application HDRToneMappingCS11, I am getting an error "This application has failed to start because d3dx11_40.dll was not found. Re-installing the application may fix this problem". I tried re-installing but no change. I have already kept /include and /lib/x86 folders in the includes in the general properties of the project. Moreover, I tried to search for the specified file in my entire system. There is no such dll as d3dx11_40.dll anywhere. However, there is d3dx11.dll available at /lib. Kindly if there is anybody who faced this problem, or fixed, let me know how to proceed. Thanks & Regards, Nirav Shah.

The D3D11 runtime is only available on Vista SP1 and Windows 7. Depending on your current OS your choices are to get the Windows 7 public beta (available until February 10, 2009) or upgrade your OS to Windows Vista SP1 if you really need to run D3D11.

Hi Bjoern, I am using Microsoft Windows XP SP3. On the download page (http://www.microsoft.com/downloads/details.aspx?familyid=5493F76A-6D37-478D-BA17-28B1CCA4865A&displaylang=en#Requirements), this configuration is included in the list on System Requirement section. Thanks & Regards, Nirav.

You can build D3D11 applications under any supported OS just fine. However, the D3D11 runtime binaries are limited to Windows 7 and Windows Vista SP 1, as stated on the same page Direct3D 11 Technical Preview, Runtime Binaries.