About This File
This plugin will display on ACP -> Plugins -> plugin row -> Plugin Details, the plugin location (installation folder).
When you install a plugin on IPS 4.0.X, it doesn't preserve Plugin Directory name you chose when you created that plugin; it installs the plugin in a random folder name, like pfc562c91e1 or p83de4d4757, etc.
Installing this plugin, you will get the exact location of the plugin. This is very handy in case you need to support a client's board and needs to know in which folder your plugin is installed.