This file is indexed.

/etc/ufw/applications.d/nginx is in nginx-common 1.10.3-0ubuntu0.16.04.3.

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

The actual contents of the file can be viewed below.

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[Nginx HTTP]
title=Web Server (Nginx, HTTP)
description=Small, but very powerful and efficient web server
ports=80/tcp

[Nginx HTTPS]
title=Web Server (Nginx, HTTPS)
description=Small, but very powerful and efficient web server
ports=443/tcp

[Nginx Full]
title=Web Server (Nginx, HTTP + HTTPS)
description=Small, but very powerful and efficient web server
ports=80,443/tcp