How to open a pem file in Putty
downoload puttygen.exe open it and browse for the ‘pem’ file, click ‘ok’ . give passphase if needed. click ‘save private key’ give a passphrase for eg:- 123 so that even if anyone start putty with that .ppk file created, they will not be able to enter unless they know the passprase. Or u can leave the passphrase null so that during connection it will ask only the username. Now open Putty.exe then go the option Connection -> SSH-> Auth -> browse -> select the .ppt file and click open.