There is only one file type that uses the .LWTP extension:
LimeWire Theme Pack
Theme or skin used by LimeWire, a P2P file-sharing program; can be used to customize the look and feel of the program's interface; to apply a LimeWire theme, select View→Apply Skins, and select the theme you want to apply.
In order for skins to be available in LimeWire, they must be stored in the following folders for Mac and Windows:
Windows: Documents and Settings\user\.limewire\themes
Updated: July 16, 2007