I have this on .htaccess on silver directorty.
### SILVERSTRIPE START ###
<IfModule mod_dir.c>
DirectorySlash Off
</IfModule>
RewriteEngine On
RewriteBase /silver
RewriteCond %{REQUEST_URI} !(\.gif)|(\.jpg)|(\.png)|(\.css)|(\.js)|(\.php)$
RewriteCond %{REQUEST_URI} ^(.*)$...