/usr/share/mediawiki-extensions/openid/OpenID.setup.php is in mediawiki-extensions-openid 3.5~deb7u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <?php
# backwards compatibility; new sites should require OpenID.php
require_once( dirname( __FILE__ ) . '/OpenID.php' );
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