I am creating a HTTP Handler to handle some files in a custom way and it appears to be ignored by DNN

in the web config I have 

<add name="FileHandling" verb="*" path="Files.aspx" type="FileHandler.FileHandler, FileHandler" />

However any link to Files.aspx does not run the code - currently the only code in the module is this 

public class FileHandler : IHttpHandler

{

public bool IsReusable

{

get { return true; }

}

public void ProcessRequest(HttpContext context)

{

context.Response.Write("Hello from custom handler.");

}

}

So I would expect to just see 'Hello from custom handler' not a 404 error

Do I need to mess with the Friendly URL settings or something to make this work?