accessing CUDA driver functions via ctypes on Windows

I’m the author of a Python package that provides bindings to various functions in the CUDA runtime and driver APIs. Does anyone know which dll file included in the Windows version of the CUDA 6.5 toolkit needs to be loaded via ctypes to access the driver functions? I don’t have access to a Windows installation.

As far as I know, the necessary dll is not installed by the CUDA 6.5 toolkit, but is installed by the GPU driver installer. driver api applicaitons should be linked against cuda.lib The dll is nvcuda.dll I believe. For 64-bit windows, nvcuda.dll is installed in C:\Windows\System32 and C:\Windows\SysWOW64