NVENC SDK samples doesn't seems to be working


I have recently downloaded Video_Codec_SDK_9.1.23 and whenever I try to run any of the samples for example : AppEncD3D11, it is giving an error “Unable to open file” is I am missing something here? I tried running sample in Administrative mode but still I am getting same error.

Do I have to pass any command line arguments or something else?
Please let me know.