This file is indexed.

/usr/share/themes/NumixBlue/openbox-3/close.xbm is in numix-blue-gtk-theme 0.54.

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

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#define close_width 8
#define close_height 8
static unsigned char close_bits[] = {
   0xc3, 0xe7, 0x7e, 0x3c, 0x3c, 0x7e, 0xe7, 0xc3 };