That tool is the free, open-source VideoLAN Client (VLC). Just drag and drop a VOB file on top of the VLC application or use VLC’s Open command and navigate to the VOB file you want to watch.

You can check individual file contents by opening them in Windows Media Player. The .VOB files can be found in the "VIDEO_TS" directory the DVD video is ripped to.

My boss asked me if I could do a simple edit on a video and burn it to DVD. No problem, I said. But there's a problem. The video I was given is in a .VOB file: 05/30/2007 09:47 AM . 05/30/2007 09 ...

Editing video .vob files Mac 911 By Christopher Breen, Macworld SEP 21, 2006 5:00 pm PDT ...

VOB, which is basically the file format structure used on DVDs, isn’t supported by the iPad so you will have to convert your movie, preferably to mpeg4 or avi format. As always it’s helpful to ...