Is there a way to get the filename of a file attached via the attachment control, without code? I do not have access to Visual Studio.
If you mean is there a rule that can retrieve the filename of an attached file, then I'm afraid the answer is no. I don't believe there is a way to do this out of the box.
qRules has a command (GetAttachmentAttribute) that will get the filename for you without having to write your own custom code. Here is a link if you're interested in a trial: http://www.qdabra.com/en/products/qRules_new.aspx