A user, Firoball most likely, once tried to convert old A3 maps into A7/ A8 maps, a few years ago. I think he did that by writing a self made tool. Wait...
http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=374797&page=1Seems like that was the beginning of his endeavour. Are you aware of that thread and the following posts (over a few weeks I guess)?