/usr/share/mysql-workbench/grt/ is in mysql-workbench-data 6.3.6+dfsg-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/mysql-workbench/grt/structs.app.xml
/usr/share/mysql-workbench/grt/structs.db.mgmt.xml
/usr/share/mysql-workbench/grt/structs.db.migration.xml
/usr/share/mysql-workbench/grt/structs.db.mssql.xml
/usr/share/mysql-workbench/grt/structs.db.mysql.xml
/usr/share/mysql-workbench/grt/structs.db.oracle.xml
/usr/share/mysql-workbench/grt/structs.db.query.xml
/usr/share/mysql-workbench/grt/structs.db.sybase.xml
/usr/share/mysql-workbench/grt/structs.db.xml
/usr/share/mysql-workbench/grt/structs.eer.xml
/usr/share/mysql-workbench/grt/structs.meta.xml
/usr/share/mysql-workbench/grt/structs.model.xml
/usr/share/mysql-workbench/grt/structs.ui.xml
/usr/share/mysql-workbench/grt/structs.workbench.logical.xml
/usr/share/mysql-workbench/grt/structs.workbench.model.reporting.xml
/usr/share/mysql-workbench/grt/structs.workbench.model.xml
/usr/share/mysql-workbench/grt/structs.workbench.physical.xml
/usr/share/mysql-workbench/grt/structs.workbench.xml
/usr/share/mysql-workbench/grt/structs.wrapper.xml
/usr/share/mysql-workbench/grt/structs.xml