downloading supporting documents from www folder in shiny application

Since the dataset that drives the app is huge, In my shiny application, I am creating a glossary page. However, I could not cover all the details. Some of them I like to provide as downloadable word or pdf files. Assuming the name of my file is

estimates.doc

which i have saved in www folder of my app, my code within the UI of the app is as follows:

library(shiny)
ui <- navbarPage("TITLE HERE",
    tabPanel("GLOSSARY",
        p("Click", a(href = "~/www/Estimation_Procedure.doc", "here"), "to download.")
    )
)

server <- function(session, input, output) {}

shinyApp(ui, server)

I am not sure how to include the downloadHandler here...i am getting the message "NOT FOUND".