This file is indexed.

/usr/lib/mime/mailcap is in mime-support 3.51-1ubuntu1.

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  ----- #

###############################################################################