Where is the epmautomate encrypt password stored?

On the server side I have encrytped a password with a script like this:

/*RTPS: {passwordPrompt}*/
String password = rtps.passwordPrompt.toString()
EpmAutomate automate = getEpmAutomate()
EpmAutomateStatus status

// encrypt
status = automate.execute('encrypt',password,"Key","password.epw")
println "EPM Automate - Encrypt - " + status.getOutput()

I have been able to succesfully use password.epw is other scripts. However, I cannot find the password.epw anywhere. Can the file be accessed or is in hidden for secruity reason? The documentation does not seem to cover this. Thanks