Just exist 'extra' folder in 'NVIDIA GPU Computing' after cuda install

OS = win10
CUDA = 10.1

I reinstalled windows10, and setting now cuda enviroment. 10.1
As I know after cuda install, some folders and files in NVIDIA GPU Computing. (ex : 'bin’folder)
But this time there is just 'extra’folder.

I installed Nvidia Driver 512.59, just driver (not PhisiX, Geforce Exprience)
And I installed Cuda tookit 10.1 .

Is anything I passed?

thank you.