What is this file: wp-config-wpe.php?

I just have been given access to an unmaintained WordPress site. I have access to the WordPress admin site, and also to the filesystem tree and PhpMyAdmin site through the host admin site.

I’m trying to setup a developer environment for this site. What I found is that there is no wp-config.php file, but there is a wp-config-wpe.php instead.

How is it even possible that the site is running in production? Where in the WordPress tree is configured the path to that config file?

wp-config.php file do not have to be at the root directory, it can also be at the directory above it (that way they are not easily accessible from the web even if php interpreter malfunctions).