I created the www and arduino, now they will upload the www folder from my sketch folder 
H:\arduino\www\sketch_sep24b
In Point 3 of the tutorial, they can access to the file via
http://boardname.local/sd/mysketch
(or 192.168.x.x/local/sd/mysketch)
I tried it
http://192.168.178.161/local/sd/sketch_sep24b, but this didnt work.
Not Found
The requested URL /local/sd/sketch_sep24b was not found on this server.