Just for the record.... I had the same problem trying to open an old d2v file - the reason was I had renamed the folder in which it was located (same if you have moved it). I resolved the problem by restarting DVD2AVI and saving a similar project as file2 in the same directory as the file I could not open. I only ran DVD2AVI for a few seconds so it created a new d2v file. I then edited the second and third line of my original d2v file (in command prompt/edit) so it matched the new dv2 file. Clear as mud eh. Basically line 2 and 3 of the d2v file contain a number and a path which need to match where the vobs are held. The path is easy to change but I needed to create a new d2v file to get the number. Hope this helps somebody - its easier than it sounds. Probably theres an easier way but I havent found it yet.