/usr/share/tcltk/tcl8.5/Tix8.4.3/bitmaps/maximize.xbm is in tix 8.4.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #define maximize_width 15
#define maximize_height 15
static unsigned char maximize_bits[] = {
0x00, 0x00, 0x00, 0x00, 0xfc, 0x1f, 0x04, 0x10, 0x04, 0x70, 0x04, 0x70,
0x04, 0x70, 0x04, 0x70, 0x04, 0x70, 0x04, 0x70, 0x04, 0x70, 0x04, 0x70,
0xfc, 0x7f, 0xf0, 0x7f, 0xf0, 0x7f};
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