aha... yes, the .vob file is the big one.
So, after I rename it to be .mpg, do I then put it in a folder, then create a link that points to the file? What happens when a user clicks on the link? Does it download the whole file to the user's PC, then plays the DVD? Is that what I want? How does the user's PC know to use e.g. Windows Media Player or RealPlayer with that file?
Link to it and it will download to visitor's PC. The MPG will play in whatever media player they have as the default for the .mpg extension.
You'll want to copy the .vob to your own PC, rename it, then see if you can simply click it to see if it plays automatically. If not it may have some added stuff and you'll want to get a .vob to .mpg converter.