/usr/include/crystalspace-2.0/csutil/win32/ is in libcrystalspace-dev 2.0+dfsg-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/crystalspace-2.0/csutil/win32/APIdeclare.inc
/usr/include/crystalspace-2.0/csutil/win32/DbgHelpAPI.fun
/usr/include/crystalspace-2.0/csutil/win32/DbgHelpAPI.h
/usr/include/crystalspace-2.0/csutil/win32/cachedll.h
/usr/include/crystalspace-2.0/csutil/win32/callstack.h
/usr/include/crystalspace-2.0/csutil/win32/csconfig-msvc.h
/usr/include/crystalspace-2.0/csutil/win32/csosdefs.h
/usr/include/crystalspace-2.0/csutil/win32/mmap.h
/usr/include/crystalspace-2.0/csutil/win32/msvc_deprecated_warn_off.h
/usr/include/crystalspace-2.0/csutil/win32/msvc_deprecated_warn_on.h
/usr/include/crystalspace-2.0/csutil/win32/psdk-compat.h
/usr/include/crystalspace-2.0/csutil/win32/registrycfg.h
/usr/include/crystalspace-2.0/csutil/win32/sanity.inc
/usr/include/crystalspace-2.0/csutil/win32/win32.h
/usr/include/crystalspace-2.0/csutil/win32/wintools.h