Many thanks. Yes, they are a heavily tweaked adaptation to Loose Files, which were, as you say quite different to any other AWI rules. I think they also inspired Dave Brown's British Grenadier.
They did indeed, although the BG rules were actually penned by "Eclaireur" rather than Dave Brown (who wrote the General de Brigade and General d'Armee rules). I must confess that "Live Free and (Or?) Die" is one of the few dedicated AWI rules I have never tried out, though I have tried to play most of the sets* that have come out since the Bicentennial in 1975/76, at least once. And BG, whilst complex to learn at first, is the best for me so far!
* I do try, generally, to avoid SYW or Napoleonic sets with "appendices" for refighting the AWI, as neither really captures the true flavour of what was, IMO, a perfectly unique conflict.