/usr/share/fwbuilder-5.3.7/os/ is in fwbuilder-common 5.3.7-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/fwbuilder-5.3.7/os/dd-wrt-jffs.xml
/usr/share/fwbuilder-5.3.7/os/dd-wrt-nvram.xml
/usr/share/fwbuilder-5.3.7/os/endian.xml
/usr/share/fwbuilder-5.3.7/os/freebsd.xml
/usr/share/fwbuilder-5.3.7/os/fwsm_os.xml
/usr/share/fwbuilder-5.3.7/os/ios.xml
/usr/share/fwbuilder-5.3.7/os/ipcop.xml
/usr/share/fwbuilder-5.3.7/os/junos.xml
/usr/share/fwbuilder-5.3.7/os/linux24.xml
/usr/share/fwbuilder-5.3.7/os/macosx.xml
/usr/share/fwbuilder-5.3.7/os/nxos.xml
/usr/share/fwbuilder-5.3.7/os/oneshield.xml
/usr/share/fwbuilder-5.3.7/os/openbsd.xml
/usr/share/fwbuilder-5.3.7/os/openwrt.xml
/usr/share/fwbuilder-5.3.7/os/pix_os.xml
/usr/share/fwbuilder-5.3.7/os/procurve.xml
/usr/share/fwbuilder-5.3.7/os/secuwall.xml
/usr/share/fwbuilder-5.3.7/os/solaris.xml
/usr/share/fwbuilder-5.3.7/os/sveasoft.xml
/usr/share/fwbuilder-5.3.7/os/unknown_os.xml