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