This file is indexed.

/etc/mailcap.order is in mime-support 3.51-1ubuntu1.1.

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

The actual contents of the file can be viewed below.

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###############################################################################
#
#  Mailcap.order:  This file allows a system-wide override of MIME program
#  preferences.  See the mailcap.order(5) man page for more information.
#
#  After modifying this file, be sure to run /usr/sbin/update-mime (as root)
#  to propagate the changes into the /etc/mailcap file.
#
################################################################################