Go to Tools>Options>Saving & this will tell you the name, location & path of the LW downld folder. Also note that anything you preview creates a preview file in the incomplete folder. eg: You preview a file that's 60 MB downlded but still incomplete, then it will create a copy of that file of the same size. These have preview added to their name. As said in the very 1st reply ... to access any files LW has downlded or stored temporarily, go to LW's Library window & choose Explore button on either the Saved Files folder or the incomplete folder.
LW User Guide:
http://www.limewire.com/english/content/userguide.shtml