Editing A Dvd Image? Add A Folder To It..how?

I have a .iso dvd image. (its not a cd ; , but DVD ;) ) I wanted to know what program I can use to edit the image and include a folder and file.

Basically, I want to wack the online crack onto the inreal dvd image. So when I install it later on after a format, or something, I will have it. :D

Thanks. :D

One thing which I can think of is extract the contents of ISO to your harddrive in some folder. Add additional programs in there and then make ISO again :)