/usr/share/gretl/data/greene/ is in gretl-data 1.9.14-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gretl/data/greene/greene10_3.gdt
/usr/share/gretl/data/greene/greene11_3.gdt
/usr/share/gretl/data/greene/greene12_1.gdt
/usr/share/gretl/data/greene/greene13_1.gdt
/usr/share/gretl/data/greene/greene14_1.gdt
/usr/share/gretl/data/greene/greene18_1.gdt
/usr/share/gretl/data/greene/greene18_2.gdt
/usr/share/gretl/data/greene/greene19_1.gdt
/usr/share/gretl/data/greene/greene22_2.gdt
/usr/share/gretl/data/greene/greene25_1.gdt
/usr/share/gretl/data/greene/greene5_1.gdt
/usr/share/gretl/data/greene/greene7_8.gdt
/usr/share/gretl/data/greene/greene8_3.gdt
/usr/share/gretl/data/greene/greene9_1.gdt
/usr/share/gretl/data/greene/wg_descriptions