Update File
Use this property to specify the newlook update program file to be used when the application is deployed.
References to the nlupdate.txt file must specify the subdirectory in which it resides on your web server (which is below the directory containing the VF_SY120.js file).
Alternatively, you can specify this value as a URL parameter when starting your application:
+NLUPDATEFILE=
This property is in the Server Details tab.