WinSCP is a popular useful windows utility which is easy to use as long as users have access to a SSH server with SFTP/SCP support.
WinSCP lets users to move files on their remote server, change permissions, create new directories or delete them. They can also edit a file directly from WinSCP by using its internal text editor. Also an external text editor can be integrated with WinSCP.
This blog post shows on how to configure WinSCP to use with Oracle Compute Instance using the Private key.