How to set SFTP protocol version through the command line

I'm using WinSCP 4.0.6 Build 358.

I'm trying to connect to a new vendor. I was receiving the errors

Cannot initialize SFTP protocol. Is the host running a SFTP server?
Exception) Error decoding SFTP packet (111, 4, 111).

I have been able to get around this and connect to them using the Windows interface by setting the Preferred SFTP Protocol Version to 4 for this particular vendor. Now I'm working on automating the upload to them using WinSCP through the command line and I'm back to getting the same error. How can I set the Preferred SFTP Protocol Version through the command line?

Please read FAQ:
How do I configure site, transfer and/or any other settings for which there are no script commands?

Thanks! That corrected my problem.

I am facing the same issue, could you or @martin help me here, only example will also be helpful. Thanks.

@saity: With latest beta 5.0.5 you can do:
See https://winscp.net/eng/docs/scriptcommand_open#rawsettings

Thanks a ton, @Martin