This file is indexed.

/usr/share/themes/Numix/openbox-3/desk.xbm is in numix-gtk-theme 2.6.7-3.

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

The actual contents of the file can be viewed below.

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#define desk_toggled_width 8
#define desk_toggled_height 8
static unsigned char desk_toggled_bits[] = {
   0xe7, 0xe7, 0xe7, 0x00, 0x00, 0xe7, 0xe7, 0xe7 };