/etc/mailcap.order is in mime-support 3.54ubuntu1.
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.
#
################################################################################
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