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:
play.google.com/store/apps/details?id=com.mixplorer.silver

From version MiX Codecs (MiXplorer Addon) 2.4:

Tiny changes.

All versions
MiX Codecs (MiXplorer Addon) 2.4

Version:2.4

Uploaded:December 13, 2021 at 8:34PM UTC

File size:0.09 MB

Downloads:796

MiX Codecs (MiXplorer Addon) 2.3

Version:2.3

Uploaded:March 29, 2021 at 12:54PM UTC

File size:11.3 MB

Downloads:1,881

MiX Codecs (MiXplorer Addon) 2.2

Version:2.2

Uploaded:February 27, 2021 at 12:57AM UTC

File size:11.29 MB

Downloads:3,003

Version:2.1

Uploaded:July 29, 2019 at 11:37PM UTC

File size:16.07 MB

Downloads:2,348

Version:2.0

Uploaded:June 24, 2019 at 7:02AM UTC

File size:16.07 MB

Downloads:450

MiX Codecs (MiXplorer Addon) 1.1

Version:1.1

Uploaded:January 28, 2019 at 6:11AM UTC

File size:12.31 MB

Downloads:1,170