Probably from the limewire props file in the LimeWire (LW's user preferences) folder within Application Data\Limewire.
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If you uninstall LW the LimeWire folder remains on your computer, unless you search for LimeWire within hidden files & folders (Application Data's hidden by default) & delete from there. That way, if you reinstall LW then your preferences are maintained from one version to the next.

The location of the LimeWire folder is...
XP: C:\Documents and Settings\your username\Application Data\LimeWire
Vista: C:\Users\your username\AppData\Roaming\LimeWire
OS X: Users -> Account Name -> Library -> Preferences -> LimeWire


If you have more questions about why certain files aren't deleted while removing LW, try asking at the LW forum & a developer might be able to give you more info
Click on the blue link to go to the LW forum: LimeWire Forums

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