/usr/share/man/man1/wimlib-imagex-unmount.1.gz is in wimtools 1.9.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/wimlib-imagex-mount.1.gz
/usr/share/man/man1/wimlib-imagex-mount.1.gz