Setting winscp with explicit encryption

I am trying to connect to a FTP server with setting on attached file

This setting works well and I can connect to ftp server via GUI (version 5.7.5)

However, when I try to convert these settings to script

winscp.com /command "option batch abort" "option confirm off" "open ftp://username:password@ftp.example.com:21 -
explicittls /" "put -filemask=>1D D:\Backups\*.bak /" "exit"

and run it from cmd, there is an error message indicated that there is "too many parameters for command 'open'"

What did I do wrong here and how to resolve it ?

Your duplicate and answered post on Stack Overflow:
https://stackoverflow.com/q/33127672/850848