/usr/lib/picolisp/doc64 is in picolisp 17.12+20180218-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/picolisp/../../share/doc/picolisp/doc64
/usr/lib/picolisp/../../share/doc/picolisp/doc64