*chrisguitarguy's* solution is the way to go ^^.

Just to add when a plugin is activated the path is stored in the `get_option`, so using 

     get_option( 'active_plugins', array());

will still store the folder name if the folder or even if the plugin name is changed. If you change the folder or plugin name on an active plugin the plugin will be de-activated, and thus require activation and storing of the correct dir/name.

Though some plugins will break if you do so, and thus not be activated so it's outside your concern.