The only way I know of to open a vts.....vob file is to import it into video editing software such as Nero, Roxio, Cyberlink, etc.
You can try dragging and dropping it into WMP.
What's bothering me is that there's two .ifo and two .bup files. Ordinarily, there would only be one of each. I'm not sure how a DVD player would play this DVD and retain all the effects, transitions, menus that may be on the original. Could be why it's not opening in WMP.