i tried usehttps://winscp.net/eng/docs/commandline#syntax to fix filename have space.
thats what i got from command line
following is my Env
WinSCP version 5.13.6(Build 906 1)
[/ode]$ G:/WinSCP/WinSCP.com /command [/code]
$ G:/WinSCP/WinSCP.exe /command
both not working for me, i still get error Unknown command
i upload my WinSCP.ini below