/usr/share/themes/Nightmare-02/openbox-3/close.xbm is in openbox 3.6.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #define close_width 5
#define close_height 5
static unsigned char close_bits[] = {
0x11, 0x0a, 0x04, 0x0a, 0x11 };
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