This file is indexed.

/usr/lib/s9fes/help/sys_unlock is in scheme9 2010.11.13-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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S9 EXT  (sys:unlock string)  ==>  unspecific

Remove the lock file (string-append STRING ".lock"). If the
file does not exist, do nothing.

(sys:unlock "foo")  ==>  unspecific