Media codecs add-on for the built-in media player of MiXplorer file manager. It won't be visible in your launcher. It can be uninstalled from Android or MiXplorer settings. MiXplorer v6.57.6+ has to be installed. You can download it from here: https://play.google.com/store/apps/details?id=com.mixplorer.silver
Additional MiX Codecs (MiXplorer Addon) Information