Or I can be polite and attach them to this post - this is d3dx9_26.dll and d3dx9_40.dll, which should fix most issues that crop up with the "hdr" dll's. Just unzip this to your WoW folder along with the other files.
Another thing that can be an issue, is that WoW uses DirectX9, and the custom DLL is a DX9 file. It depends on DirectX9 being installed, even if you're running Vista or Win7, which have DX10/11 on them. If adding the DLL's I've attached doesn't fix the issue, check out Microsoft's website and download DirectX 9.
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-- Taryble
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