/usr/include/ is in libmstoolkit-dev 77.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libmstoolkit/
/usr/include/libmstoolkit/expat.h
/usr/include/libmstoolkit/crc32.h
/usr/include/libmstoolkit/latin1tab.h
/usr/include/libmstoolkit/zlib.h
/usr/include/libmstoolkit/inffixed.h
/usr/include/libmstoolkit/xmltok_impl.h
/usr/include/libmstoolkit/internal.h
/usr/include/libmstoolkit/winconfig.h
/usr/include/libmstoolkit/RAWReader.h
/usr/include/libmstoolkit/inftrees.h
/usr/include/libmstoolkit/MSNumpress.hpp
/usr/include/libmstoolkit/gzguts.h
/usr/include/libmstoolkit/xmlrole.h
/usr/include/libmstoolkit/sqlite3.h
/usr/include/libmstoolkit/MSObject.h
/usr/include/libmstoolkit/MSToolkitTypes.h
/usr/include/libmstoolkit/utf8tab.h
/usr/include/libmstoolkit/MSReader.h
/usr/include/libmstoolkit/xmltok.h
/usr/include/libmstoolkit/deflate.h
/usr/include/libmstoolkit/inflate.h
/usr/include/libmstoolkit/inffast.h
/usr/include/libmstoolkit/ascii.h
/usr/include/libmstoolkit/zutil.h
/usr/include/libmstoolkit/zconf.h
/usr/include/libmstoolkit/Spectrum.h
/usr/include/libmstoolkit/iasciitab.h
/usr/include/libmstoolkit/nametab.h
/usr/include/libmstoolkit/expat_config.h
/usr/include/libmstoolkit/mzParser.h
/usr/include/libmstoolkit/trees.h
/usr/include/libmstoolkit/expat_external.h
/usr/include/libmstoolkit/asciitab.h