Problems in Creating Excel add-in Using CUDA and Visual Studio

My System:

Win7 Professional/64-bit + Excel2010 32-bit

GPU: GTX Titan black.

I am following the SDK example in CUDA 6.0 RC to create the .XLL file but when I trid
to load it to the excel file, I always get the message" not a valid add-in".

I am using the configuration 32-bit build platform, and 32-bit library for
EXCEL 2010 XLL SDK.

Is anyone knows the reason about this?