/usr/lib/libMyGUI.OgrePlatform.so is in libmygui-dev 3.2.2+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libMyGUI.OgrePlatform.so.0debian1
/usr/lib/libMyGUI.OgrePlatform.so.0debian1