/usr/lib/blt2.4/treeview.xbm is in blt 2.4z-7ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #define test_width 16
#define test_height 16
#define test_x_hot 7
#define test_y_hot 7
static unsigned char test_bits[] = {
0x00, 0x00, 0x60, 0x06, 0x60, 0x06, 0x60, 0x06, 0x60, 0x06, 0x64, 0x26,
0x66, 0x66, 0x7f, 0xfe, 0x66, 0x66, 0x64, 0x26, 0x60, 0x06, 0x60, 0x06,
0x60, 0x06, 0x60, 0x06, 0x60, 0x06, 0x00, 0x00};
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