Vob extension is related to Video Object - movie files. You have chance to open vob files with current video players.
Vob extension stands for raw video format which used with Dvd. The capacity of vob files can be reduced by compressing divx softwares. If you need to convert this file to avi easily, you have chance to use AutoGordianKnot program which can be downloaded free via internet.
To get detailed informations, please check the following links.
What to use VOB
current video players.
which page related to VOB file
VOB Related Searches
You can check related links about VOB fileextension.