I'm afraid I've given up on it. I tried to convert things and it was too much effort, the order of the images were all over the place (even ones numbered properly), as in totally random order - it takes hours to organise if there are a few hundred images.
Plus the save, open, etc options don't work - so if you want to redo the same project you have to start all over again. I'm using it under Ubuntu, so it may be an incomplete conversion, but no, takes waaay too much time.
That said the image quality was quite good. It's a good idea, and if it were working - but as it is, waaaay too time consuming.