linux, install custom MIME type

mytypecccf/mime.xml:

<?xml version="1.0"?>
 <mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
   <mime-type type="application/x-mytypecccf">  
   <comment>SabaCentra Client</comment>
   <glob pattern="*.cccf"/>
  </mime-type>
 </mime-info>

cli:

xdg-mime install mytypecccf-mime.xml