Not answering your question directly I know. But do you need to convert them now? Why not archive them as they are and "convert" them when you need them.
Excel will open Lotus 1-2-3 files, (File - Open scroll down "Files of Type" to Lotus 1-2-3 files)
Word will not open .lwp, I don't think. But you could down load Lotus Symphony for free and open and save documents as you need them into .doc