Re: Can't use /bin/sh as shell.
Then why does it work fine with pscp and scp w/o modification?
Because strictly speaking WinSCP is not a SCP client, as:
As the SCP protocol implements file transfers only, WinSCP must use other means to implement the additional functionality (like directory listing). WinSCP uses Unix-like shell commands to do that. This in turn means that when using the SCP protocol, it can connect to servers that run Unix-like or its emulation only
Also quoting Wikipedia SCP article:
As the SCP protocol implements file transfers only, GUI SCP clients are rare, as implementing it requires additional functionality (directory listing at least). For example, WinSCP defaults to the SFTP protocol. Even when operating in SCP mode, clients like WinSCP are typically not pure SCP clients, as they must use other means to implement the additional functionality (like the ls command). This in turn brings platform-dependency problems.