That is for windows... I am a Mac user hasn't @Richard G told you yet..LOLTry winscp ..
Also with .. key's in combi with putty i find it way better.
WinSCP
WinSCP is a popular free SFTP and FTP client for Windows, a powerful file manager that will improve your productivity. It supports also local-local mode and FTPS, S3, SCP and WebDAV protocols. Power users can automate WinSCP using .NET assembly.winscp.net