If you're trying to use the Apple CD/DVD extension with a DVD-RW drive, I do not think that works. At least, I'm pretty sure that on my Umax S900 (very similar to 9600) the Apple extension does not operate the DVD-RW drive.
If the DVD player software you're using will work with other extensions, then try the extension from Toast which allows reading disks in an RW drive.
If the DVD player software requires the Apple extension, then find a DVD-ROM drive. I have a DVD-ROM drive on my Acard 6280M in my Umax S900 and it works great with the Apple extension, although I have not used it to play DVDs the way you're doing.
To play DVDs I use a Wired4DVD card.