/usr/share/afterstep/desktop/buttons/as-switchwindow-a-pressed.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 4 5 6 7 8 | <bevel border="1 1 3 3" colors="#000000 #FFFFFF" solid=0>
<composite>
<solid color="#C0C0C0" width=15 height=15/>
<tile tint="#010101">
<rotate angle=180><img src="dots/arrow_short_small"/></angle>
</tile>
</composite>
</bevel>
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