This file is indexed.

/usr/share/mysql/magic is in percona-xtradb-cluster-server-5.7 5.7.20-29.24-0ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# Add the following to the end of your /etc/magic file to get the 'file'
# command to recognize some MySQL files.
#
0       beshort           0xfe01        MySQL table definition file
>2      byte            x               Version %d
0       belong&0xffffff00 0xfefe0300    MySQL MISAM index file
>3      byte            x               Version %d
0       belong&0xffffff00 0xfefe0700    MySQL MISAM compressed data file
>3      byte            x               Version %d
0       belong&0xffffff00 0xfefe0500    MySQL ISAM index file
>3      byte            x               Version %d
0       belong&0xffffff00 0xfefe0600    MySQL ISAM compressed data file
>3      byte            x               Version %d
0       string           \376bin        MySQL replication log