wcf REST service file downloading

Question

Hi everyone,

I am new to Wcf and Rest Service implementation.I have created one wcf Rest service project using the REST service starter kit. 

My problem is i want to write a method which will be used to download files. The Url will be sent to the recipient mail address so when he clicks on the url it will download the files (.doc,.pdf...) .

The url will be like this

http://localhost:1128/Service1.svc/download/57

And the file to be downloaded will be  having a virtual path which is like "/downloads/documents..." 

Any Solution will be highly appreciated.