If the problem is indeed that your version of CAMERA RAW doesn't support that file type, then you'll probably just have to find an alternative option, or somehow get an updated version of CS2. I'm sure theres a "broked" version of a CAMERA RAW update that supports CR2, shouldn't be too hard to find.
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Support for the 5D was added in Camera Raw 3.3. So please make sure you do have 3.7 installed. Go to Photoshop and click on the Help menu, select About Plugins and then select Camera Raw.
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Sounds like this is the route you need to go, if you want support in CS2.