.htaccess affecting url to sitemap

Morning all,

have had a problem were there were no rewrite rules in the .htaccess file which prevented the url to the sitemap working xyz.com/sitemap.xml.

Theis was new install of the latest version of WP, single install and the .htaccess was like this after the infinite was installed and activated

# Switch rewrite engine off in case this was installed under HostPay.
RewriteEngine Off


DirectoryIndex index.cgi index.php

# BEGIN WordPress

# END WordPress

So I copied the .htaccess from another on my blogs that also runs infite and put that up instead:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

# END WordPress

No more sitemap.xml 404

But I guess my questions is "should infinite be writing the .htaccess file when its installed and activared", oh by the way am using infinate verison 1.3.7