/usr/share/afterstep/desktop/buttons/3.xpm is in afterstep-data 2.2.12-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <bevel colors="#000000 #000000" border="1 1 1 1">
<solid color="#FF0000" width="15" height="15"/>
</bevel>
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