/usr/share/gosa/plugins/admin/mimetypes/ is in gosa-plugin-goto 2.7.4+reloaded2-1+deb8u2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gosa/plugins/admin/mimetypes/class_filterMIMETYPES.inc
/usr/share/gosa/plugins/admin/mimetypes/class_mimetypeGeneric.inc
/usr/share/gosa/plugins/admin/mimetypes/class_mimetypeManagement.inc
/usr/share/gosa/plugins/admin/mimetypes/generic.tpl
/usr/share/gosa/plugins/admin/mimetypes/main.inc
/usr/share/gosa/plugins/admin/mimetypes/migration/
/usr/share/gosa/plugins/admin/mimetypes/migration/class_migrate_mimetypeRDN.inc
/usr/share/gosa/plugins/admin/mimetypes/mimetype-filter-release.xml
/usr/share/gosa/plugins/admin/mimetypes/mimetype-filter.xml
/usr/share/gosa/plugins/admin/mimetypes/mimetype-list-release.tpl
/usr/share/gosa/plugins/admin/mimetypes/mimetype-list-release.xml
/usr/share/gosa/plugins/admin/mimetypes/mimetype-list.tpl
/usr/share/gosa/plugins/admin/mimetypes/mimetype-list.xml
/usr/share/gosa/plugins/admin/mimetypes/paste_generic.tpl
/usr/share/gosa/plugins/admin/mimetypes/tabs_mimetypes.inc