Path for download products

Hi,

I can’t manage to set up a relative path to a download product. How can I do that. The Download Files i want to add are below the web-root.
Example:
My wordpress installation is something like this

myaccountname/htdocs/wordpress/

the download files are locatd here

myaccountname/dfiles

../../dfiles/file.zip

did not works as path to the download file in woocommerce.

Thanks in advance.
dj

http://wordpress.org/extend/plugins/woocommerce/