Are these releases on newsgroups in the form of a blu-ray ISO or just the BDMV and Certificate folders?

I ask because I am able to download them, but not burn them, at the moment, as I have no blu-ray drive on my PC. I was hoping to play the m2ts files on my WD HD media player, or otherwise turn them into mkv files, but I don't think I would be able to extract a blu-ray ISO.

I am only interested in Return of the Jedi and Revenge of the Sith; the BD-25 versions would be fine. I would be grateful for any help/advice. (I'm in the UK.)