add external folder to webapp context path in tomcat

Question

I need to add an external folder (Ex: D:\photos) to my webapp context path in Tomcat. Here's what I've done: I've created a xml file MyApp#photos.xml in CATALINA_BASE/conf/Catalina/localhost/ which contains:

<?xml version="1.0" encoding="UTF-8"?>
<Context docBase="d:\photos"/>  

but when I try to access this folder at "http://localhost:8084/FamilyTree/photos/" I receive HTTP Status 404. I think I'm missing something...Any help would be appreciated. I'm using Tomcat 6.0.20 and Netbeans 6.8