[Rails] Opening a folder for file selection

Hello,
I am trying to provide a link which, when clicked, will supply a
folder which I've previously selected for users to click and open
various files in (some pdf, some .doc, maybe even .odt).

In routes.rb I put:
get 'public' => 'people#upload'

In application.html.erb I put:
<a href="http://localhost:3000/public" >Read a File</a>

And in people_controller.rb requesting a specific file works to
open the correct download window:

def upload

send_file("C:\\ -- a specific folder and file --", :disposition =>
'attachment' , :type => 'application/pdf')

end

But since I don't want to preselect a file for them, from this
preselected folder, how to I just show the folder and let the user
double-click which one they want to open in another window?
Thanks,
Barney

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