Ohh, sorry, there I go, blabbing off about WinRAR being able to compress/decompress .LZS files *Next time I'll not drink as much Vodka & Coke before typing up a post to help someone, lol* No, it can't handle the LZS format, I tried looking for one too, but nothing at all.
There maybe a way that LZS files can be decompressed with WinRAR, by copying the files to your HD, and changing the file-type to a known compressed file format (Like LZH, which I did get mixed up with LZS for some reason) but I highly doubt that it'd work, you can give it a shot, you never know till you try, but I agree with Seph: I do think you're better off using one of Qhimm's programs.
Anyway, sorry again about the 'Trés faux' information I gave you *I just realised my mistake after the internet was turned off last night*