There are 102 versions of nvapi64.dll in the wild, the latest version being 9.18.13.4043. The average file size is about 2.32 MB. The file is a digitally signed and issued to NVIDIA Corporation by VeriSign. Some variations of the file have been seen to be installed with the program NVIDIA Graphics Driver 306.02 from NVIDIA Corporation. The executable is a .NET framework assembly utilizing the CLR.
(Note, the programs listed below are for all versions of NVIDIA Windows drivers.)
United States installs about 33.96% of NVIDIA Windows drivers.