This file is indexed.

/etc/xdg/xfce4/helpers.rc is in libexo-common 0.10.7-1.

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

The actual contents of the file can be viewed below.

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#
# Default helpers.rc for Xfce's Preferred Applications
#
# Copyright (c) 2005-2006 Benedikt Meurer <benny@xfce.org>
#

WebBrowser=debian-sensible-browser
MailReader=thunderbird
TerminalEmulator=debian-x-terminal-emulator
FileManager=Thunar