winscp.com /keygen c:\tmp\pem\aws.pem /output=c:\tmp\aws.ppk
ssh -N -L 2222:ec2-52-79-91-131.ap-northeast-2.compute.amazonaws.com:22 -i c:\tmp\pem\aws.pem root@139.162.121.30
winscp.exe ubuntu@127.0.0.1:2222 /privatekey=c:\tmp\aws.ppk