You can use them (that is, .ov2 files), as soon as they're converted to something that can be converted into MM format. There should be a converter available somewhere. In any case it's not difficult to make one, I have a couple of perl scripts that can do it. There are also msdos tools available from TT's site that can convert .ov2 files to text.
(more later if necessary, got to run to catch a bus)