I did this:
If you're using XP, look below.

Go to Control Panel > Folder Options > click on the View tab > put a dot in the circle next to ‘show hidden files and folders’ > apply > ok.

Go to Start > click on My Computer > double click on Documents and Settings > double click on the folder with your username > double click on Application Data. Now look for a folder named LimeWire. This folder named LimeWire is your preferences folder. You need to open the LimeWire folder by double clicking on it.

And there is no LimeWire folder in my App Data folder!! Is that bad?