Change the Engine Passphrase on Microsoft Windows To change the passphrase defined for the engine at installation: Click Start > Run > Browse. Double-click the following file in the install_dir\bin directory: stopEngine.bat Click OK. Type the engine passphrase and press Enter. The engine stops. Double-click the following file: changePassphrase.bat Click OK. Type the current passphrase and press Enter. Type the new passphrase and press Enter. Retype the new passphrase and press Enter. Your new passphrase is effective the next time you start the engine.