/usr/lib/GNUstep/SOGo/SchedulerUI.SOGo/Resources is in sogo-common 3.2.6-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/GNUstep/SOGo/SchedulerUI.SOGo/../../../../share/GNUstep/SOGo/SchedulerUI.SOGo/Resources