I don't honestly know. I think ACR is a separate entity from the OS. They both handle RAW in similar ways, but they don't "share".
Have you tried using Image Capture.app? Unfortunately, that will be dependant on the OS RAW interpreter, and 10.4 is pretty old by Apple standards now.

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Snaptophobic BloggageHeather Kay: modelling details that matter. "Let my windows be open to receive new ideas but let me also be strong enough not to be blown away by them." - Mahatma Gandhi.