You may want to save a subtree's content to a file, or read the content of a file into a subtree .
The simplest way to do it is to select a directory node, click the right mouse button and either choose Read from File or Save to File
You may want to save a subtree to a file, e.g. Search Engines, and load it into as the subtree of another browsing tree
As a side effect of saving to a file , the directory URL will be set to the newly created file