Magento Version: 18.104.22.168
I’m not sure when this feature was added. It’s there in 22.214.171.124 and might be in previous version.
The phtml template file for your system emails are located in
However, you don’t want to edit these files. Instead, go to
System -> Transactional Emails
This UI will let you create a copy of the email in the Admin Console.
Then, if you go to
System -> Configuration
Each email has a config option somewhere that will let you choose a template. For example
System -> Configuration -> Email a Friend -> Select Email Template
This is a perfect place to use my free System Config Search extension.