Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//usr/share/mime/video/mj2.xml

 <?xml version="1.0" encoding="utf-8"?>
<mime-type xmlns="http://www.freedesktop.org/standards/shared-mime-info" type="video/mj2">
  <!--Created automatically by update-mime-database. DO NOT EDIT!-->
  <comment>JPEG-2000 MJ2 video</comment>
  <acronym>MJ2</acronym>
  <expanded-acronym>Motion JPEG-2000</expanded-acronym>
  <glob pattern="*.mj2"/>
  <glob pattern="*.mjp2"/>
</mime-type>