/usr/ is in libcaja-extension-dev 1.20.2-4ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/caja/
/usr/include/caja/libcaja-extension/
/usr/include/caja/libcaja-extension/caja-column-provider.h
/usr/include/caja/libcaja-extension/caja-column.h
/usr/include/caja/libcaja-extension/caja-extension-types.h
/usr/include/caja/libcaja-extension/caja-file-info.h
/usr/include/caja/libcaja-extension/caja-info-provider.h
/usr/include/caja/libcaja-extension/caja-location-widget-provider.h
/usr/include/caja/libcaja-extension/caja-menu-item.h
/usr/include/caja/libcaja-extension/caja-menu-provider.h
/usr/include/caja/libcaja-extension/caja-menu.h
/usr/include/caja/libcaja-extension/caja-property-page-provider.h
/usr/include/caja/libcaja-extension/caja-property-page.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libcaja-extension.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libcaja-extension-dev/
/usr/share/doc/libcaja-extension-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/Caja-2.0.gir
/usr/lib/x86_64-linux-gnu/libcaja-extension.so
/usr/share/doc/libcaja-extension-dev/changelog.Debian.gz