This is the default example configuration of dir.conf provided by Apache. This config file was generated by Apache running on Ubuntu 12.04.
It is located under: /etc/apache2/mods-available/dir.conf
<IfModule mod_dir.c>
DirectoryIndex index.html index.cgi index.pl index.php index.xhtml index.htm
</IfModule>
Download the raw file with wget or curl
wget -O dir.conf.example http://exampleconfig.com/static/raw/apache/ubuntu12.04/etc/apache2/mods-available/dir.conf
curl http://exampleconfig.com/static/raw/apache/ubuntu12.04/etc/apache2/mods-available/dir.conf > dir.conf.example
Other config files you might find useful