/usr/share/afterstep/desktop/icons/ostxu.xpm is in afterstep-data 2.2.12-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <hsv affected_hue="#0000FF" affected_radius="60" hue_offset="310">
<img src="bars/ostx"/>
</hsv>
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