The easiest way to go take a look at the famous system configuration filesystem is to install the Default File System Viewer by Blue Marsh Softworks.
While browsing the filesystem remember that each node has a "Name" property (use the Properties Window to see the properties of each node). You must use the "Name" to refer to the node in the filesystem.
For instance, in default (English) locale the menu bar appears as the node "Menu Bar" in the filesystem viewer, but its nonlocalizable code name is "Menu". So to refer to the menu bar in your layer.xml file you have to use the name of the node, like this:
<folder name="Menu Bar">
Source: NetBeans FAQ