This file is indexed.

/usr/share/postgresql/9.6/extension/plproxy--unpackaged--2.7.0.sql is in postgresql-9.6-plproxy 2.7-1.

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

The actual contents of the file can be viewed below.

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ALTER EXTENSION plproxy ADD FUNCTION plproxy_call_handler();
ALTER EXTENSION plproxy ADD LANGUAGE plproxy;
ALTER EXTENSION plproxy ADD FUNCTION plproxy_fdw_validator(text[], oid);
ALTER EXTENSION plproxy ADD FOREIGN DATA WRAPPER plproxy;