Possible to enable dx9 on Win8?

I am currently running dolphin on windows 8 and it's all pretty flawless. One question I have though is If it's possible to use dx9 as the video backend. Currently I can only select between Direct3d, OpenGL and software render. I'd like to use directx9 because it won't break the custom texture packs that I'm using.

I understand that texture packs will work just fine with OpenGL but there's audio stuttering issues with OpenGL that I don't experience with direct3d.

Thanks for any help