Check that your limewire folder isn't marked as a hidden folder. Go to "My Computer" click on your external hdd, find the folder with your files in it(limewire). Right click on it > "Properties", look under "Attributes", if "Hidden" is checked, uncheck it, click "Apply" then "OK". Go back to your LW library page and click the "Refresh" button. With any luck your files will be showing.

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If it ain't broke, fix it till it is!