/usr/lib/mime/mailcap 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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#
# MIME types and programs that process those types
#
# Much of this file is generated automatically by the program "update-mime".
# Please see the "update-mime" man page for more information.
#
# Users can add their own rules if they wish by creating a ".mailcap"
# file in their home directory. Entries included there will take
# precedence over those listed here.
#
###############################################################################
###############################################################################
#
# User section follows: Any entries included in this section will take
# precedence over those created by "update-mime". DO NOT CHANGE the
# "User Section Begins" and "User Section Ends" lines, or anything outside
# of this section!
#
# ----- User Section Begins ----- #
# ----- User Section Ends ----- #
###############################################################################
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