Converting vro video_3 parts in 1 file

I got a dvd with vro(mpeg2) file. My desktop dvd player this format cannot see=this can solve the conversion. But the problem is that there are three separate records 25min each, but only one 4gb file. How is it possible to split this file when pc converter (Freemake Video Converter) sees only the first one? Other two there are not here. Recommend another program pls that could do it.
thanks for the advice
Peter