/usr/lib/libXvMCW.so.1 is in libxvmc1 2:1.0.6-1ubuntu2.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libXvMCW.so.1.0.0
/usr/lib/libXvMCW.so.1.0.0