/usr/share/sounds/moblin/stereo/bell-window-system.wav is in moblin-sound-theme 0.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/sounds/moblin/stereo/single-very-low.wav
/usr/share/sounds/moblin/stereo/single-very-low.wav