C++ DirectX 9 unresolved external symbol

With the legacy DirectX SDK, you have to set up distinct x86 vs. x64 library include paths:

In VC++ Directories for 32-bit configurations:


In VC++ Directories for 64-bit configurations:


See Microsoft Docs

For new projects you should be using Direct3D 11, and you do not need to use the legacy DirectX SDK at all.

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