SOAP with attachments

Hello everyone, I am trying to publish a web service orchestration in BizTalk Server 2006 that accepts SOAP with attachments. For one of our vendors I have to setup a simple web service that exposes a single method that expects a file sent as a SOAP attachment. Right now I'm playing around with a separate ASP.Net web service that simply places the attachment in a directory for BizTalk to find, but is there a way to handle SOAP attachments inside an orchestration? Any help would be greatly appreciated. Thank you.