/usr/lib/freefoam/libOSspecific.so.1 is in libfreefoam1 0.1.0+dfsg+1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/freefoam/libOSspecific.so.0.1.0
/usr/lib/freefoam/libOSspecific.so.0.1.0