loading dpcap under ntopng 3.4 under Win2016

Hello forum
I tried to load a capture file into ntopng running ntopng under
Windows2016. But no luck :-)
What am i doing wrong?
Thank's!

Joe

C:Program Filesntopng>ntopng -i 
xplico.org_sample_capture_protocols_supported_in_0.6.3.pcapUnrecognized
option: -i
Available options:
/i [ntopng options] - Install ntopng as service
/c                  - Run ntopng on a console
/r                  - Deinstall the service
/h                  - Prints this help

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