Index: wp-includes/rewrite.php
===================================================================
--- wp-includes/rewrite.php	(revision 12594)
+++ wp-includes/rewrite.php	(working copy)
@@ -1653,6 +1653,7 @@
 		$rules = "<IfModule mod_rewrite.c>\n";
 		$rules .= "RewriteEngine On\n";
 		$rules .= "RewriteBase $home_root\n";
+		$rules .= "\nRewriteRule \.(gif|png|jpe?g|css|js|ico)$ - [L]\n\n";
 
 		//add in the rules that don't redirect to WP's index.php (and thus shouldn't be handled by WP at all)
 		foreach ( (array) $this->non_wp_rules as $match => $query) {