i assume that when you say "all the vob files", you are talking about combining the .vob files of a DVD. this can be done with DVD Decrypter. Open DVD decrypter, and go to Tools > Settings > IFO Mode tab. in the drop down box for "File Splitting" choose "None" and click OK. back at the main window, go to Mode > IFO, then click decrypt. the result is one large .vob hope this helps...