I cannot open a Sony NEX-5N .ARW file in CS3, and I have the latest camera extension installed. I really want to ope the RAW file, not convert it to Jpeg firt. Any Whiz having it figured out yet? Sony is not helpful at all and I suspect them to really wanting to force you tu use their much less powerfull software, which does not offer what I need (don't asl what I need please, not my question, sorry)
Latest CameraRaw (6.6) can not be installed in CS3 - it's incompatible.
And CameraRaw from CS3 does not understand your RAW files from new camera.
The solution would be to use free Adobe DNG Converter.
Download DNG Converter from here: http://www.adobe.com/support/downloads/product.jsp?product=106&platform=Windows (Windows) or here http://www.adobe.com/support/downloads/product.jsp?product=106&platform=Macintosh (Macintosh)
Then convert your proprietary ARW files (you may want to save backups) to DNG - DNG is a standart RAW format (open standard), and RAW data itself is saved untouched, just metadata is organized in a different way.
So you will keep RAW image data unmodified and will be able to edit it in any application that support DNG - there are a lot, including Photoshop.
After that you will be able to open and edit your images in CS3.
Another way is to update to CS5...