/usr/include/boost/asio/windows/ is in libboost1.58-dev 1.58.0+dfsg-5ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/boost/asio/windows/basic_handle.hpp
/usr/include/boost/asio/windows/basic_object_handle.hpp
/usr/include/boost/asio/windows/basic_random_access_handle.hpp
/usr/include/boost/asio/windows/basic_stream_handle.hpp
/usr/include/boost/asio/windows/object_handle.hpp
/usr/include/boost/asio/windows/object_handle_service.hpp
/usr/include/boost/asio/windows/overlapped_ptr.hpp
/usr/include/boost/asio/windows/random_access_handle.hpp
/usr/include/boost/asio/windows/random_access_handle_service.hpp
/usr/include/boost/asio/windows/stream_handle.hpp
/usr/include/boost/asio/windows/stream_handle_service.hpp