How do you convert VST so that you can edit?

Hi, any help would be great. I purchased a VHS with a built in DVD writer and player. I next copied all of my home movies and burned them onto DVD’s. Next I took the DVD and put them into my Mac so that I could edit them. I tried iMovie, Adob Premiere and Final Cut Pro. Nome of them can read the VST format of the DVD. Does anyone know what software that I need to convert the VST files? or any advice on how to edit a DVD on a Mac computer?