The subdirectory path, relative to the selected Folder Context, where the desktop item should be created.
For example, to create an icon on Windows under Start | Program Files | <ProductName> | <ProductDesktopIcon>, specify "<folder>/<subfolder>" for this property. Make sure that Windows has been enabled (click the checkbox next to the Windows Platform), and set the Windows Folder Context property to "Programs Menu for Current User" or "Programs Menu for All Users". Leave blank for the icon to appear on the desktop not inside of a folder.