Bravely done and a fair return for hand held.
I was surprised at how short the exposures can be for fireworks having done my first this past New Year (posted in this category on IIS). Still, I would have had far less sucess if I hadn't had a tripod so, well done.
Odd that CS5 won't open the RAW since they are standard CD2, aren't they?
Grab Raw Therapee from
http://rawtherapee.com/ and try that. It is like using Lightroom, or Corel Photoshop, but with the advantage of being free. It might give you a processing tool for the G1X
Trev