This file is indexed.

/etc/X11/app-defaults/XXkb is in xxkb 1.11-2.1ubuntu2.

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

The actual contents of the file can be viewed below.

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XXkb.image.path: /usr/share/xxkb

XXkb.group.base: 1
XXkb.group.alt: 2

XXkb.mainwindow.enable: yes
XXkb.mainwindow.geometry: 48x48
XXkb.mainwindow.image.1: en48.xpm
XXkb.mainwindow.image.2: ru48.xpm
XXkb.mainwindow.image.3: su48.xpm
XXkb.mainwindow.image.4:
XXkb.mainwindow.label.font: -misc-*-r-*-20-*

XXkb.*.border.color: black
XXkb.*.border.width: 0

XXkb.*.label.foreground: white
XXkb.*.label.background: blue4
XXkb.*.label.enable: no

! XXkb.mainwindow.type:
! possible values - normal, top, tray, wmaker

XXkb.button.enable: yes
XXkb.button.geometry: 15x15-60+7
XXkb.button.image.1: en15.xpm
XXkb.button.image.2: ru15.xpm
XXkb.button.image.3: su15.xpm
XXkb.button.image.4:
XXkb.button.label.font: -misc-*-r-*-13-*

XXkb.controls.add_when_start: yes
XXkb.controls.add_when_create: yes
XXkb.controls.add_when_change: no
XXkb.controls.focusout: no
XXkb.controls.two_state: yes
XXkb.controls.button_delete: yes
XXkb.controls.button_delete_and_forget: yes
XXkb.controls.mainwindow_delete: yes

XXkb.mousebutton.1.reverse: no
XXkb.mousebutton.3.reverse: no

XXkb.bell.enable: no
XXkb.bell.percent: -50

XXkb.ignore.reverse: no

! XXkb.app_list.<match>.<action>: <list>
! <match> is one of "wm_class_class", "wm_class_name", "wm_name", "property"
! <action> is one of "ignore", "start_alt", "alt_groupM" (M - 1..4) 
! For example:
!   XXkb.app_list.wm_class_class.ignore: *clock Fvwm*
!   XXkb.app_list.wm_class_name.start_alt: licq
!
!  ignore windows in KDE tray
!  XXkb.app_list.property.ignore: _KDE_NET_WM_SYSTEM_TRAY_WINDOW_FOR