Rewrites for Apache w/friendly urls
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There is optional functionality for the sitemap.
You can have the sitemap generate and manage the robots.txt file for you. If you do so, you need to add a special set of rewrites
to your XenForo installation so we can "capture" the robots.txt file and redirect that for the add-on to generate

This assumes you DO NOT have "friendly Urls". If you already have an .htaccess file, see the Rewrites-Apache-Friendly-Urls.txt file

You need to do a couple of things
1) Create an .htaccess file in your XenForo directory
2) Add a custom rewrite to robots.txt

The .htaccess file contents will be

	<IfModule mod_rewrite.c>
		RewriteEngine On
		RewriteRule (robots\.txt)$ robots.php [NC,L]
	</IfModule>