Read file path from config

I have a question about file path setting in web.config.
Currently I have this in web.config  <add key="CoursesPath" value="C:\Webfiles\Courses\" />
and read in the vb code using  ConfigurationManager.AppSettings("CoursesPath").
From this folder I can download the file.
 
Now, another application (in a different server) wants to access these files.
How do I change the path in web.config to  include domainname\folder\filename or server details with folder name
So that file can be downloaded from application in different servers.
Thanks.