id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
13500	Add support for XML in allowed extensions and mime types	fazalmajid		"As with #12849, please add CSV and XML types to wp_ext2type() or get_allowed_mime_types() in functions.php.

The patch I use on my local install of Wordpress is:

{{{
--- wp-includes/functions.php~  Wed Dec 23 19:38:49 2009
+++ wp-includes/functions.php   Wed Dec 30 16:09:13 2009
@@ -2324,6 +2324,10 @@
                'odc' => 'application/vnd.oasis.opendocument.chart',
                'odb' => 'application/vnd.oasis.opendocument.database',
                'odf' => 'application/vnd.oasis.opendocument.formula',
+               'py' => 'application/python',
+               'xml' => 'text/xml',
+               'csv' => 'text/csv',
                ) );
        }
}}}
"	enhancement	new	normal	Future Release	Upload		minor