/usr/share/pixmaps/amsn.png is in amsn 0.98.9-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/pixmaps/../amsn/desktop-icons/48x48/apps/amsn.png
/usr/share/pixmaps/../amsn/desktop-icons/48x48/apps/amsn.png