/usr/share/man/man1/icewm-gnome.1x.gz is in icewm-gnome-support 1.3.7-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/../man7/icewm-common.7.gz
/usr/share/man/man1/../man7/icewm-common.7.gz