Note: Camera Raw version 4.0 is included with CS3.
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That camera was supported for the first time in ACR 5.2, which ran with Photoshop CS4.
If you are not planning on upgrading your Photoshop to CS4 or CS5 right away, you need to download the free, stand-alone Adobe DNG Converter version 5.7 to convert your raw Canon files to DNG raw files first. Then you will be able to open those DNGs in Camera Raw in CS3.
You should update your ACR in CS3 to version 4.6 ASAP, though. ACR 4.0 is woefully obsolete and nobody should be running that old version.
Be aware, however, that you will be leaving a lot of image quality behind by staying with that old version of ACR in CS3. Camera Raw 5.7 (the current and last version for CS4) is light years ahead of ACR 4.x. ACR 6.1 (currently a Release Candidate) which requires CS5 is even a bit better than ACR 5.7.
ACR 4.x is really old technology. If you can afford that camera, you most certainly can afford to upgrade to CS5.
Wo Tai Lao Le
I had trouble with my Canon 40D in openig RAW files. I had alll sorts of replies, many of which didn't mean a lot to me (no disrespect to the experts that replied - am sure they know truckloads more than I ever will). I did, however, sort the problem by upgrading to CS4 - job done!
Done. Thank you everyone who replyed. I really appreciate your time. The only thing now, is why in my Bridge preview, are the images thumbnail size? (Not ACR.)
Hmmm... Seems to have fixed itself.