The machine is 64-bit capable, but back then there was very little software that would take advantage of that, so the machines booted by default into 32 bit. My iMac purchased last November boots into 32 by default. My iMac purchased in May boots into 64.
In your case, I wonder if the Sony Library is compatible with Tiger. Very little seems to be, anymore. That's why I finally retired my oldest iMac a few months back.
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