/usr/share/emacs/site-lisp/elpa-src/engine-mode-2.0.0/engine-mode-pkg.el is in elpa-engine-mode 2.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ;;; -*- no-byte-compile: t -*-
(define-package "engine-mode" "2.0.0" "Define and query search engines from within Emacs." 'nil :url "https://github.com/hrs/engine-mode/engine-mode.el")
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