Long answer: OS X doesn't have 32-bit and 64-bit versions it uses a universal binary format which allows programs, system components, etc to be installed with both 32- and 64-bit code, and the system simply picks the "best" one to use based on the CPU you're on. You can check the CPU with the command sysctl hw.cpu64bit_capable ( 0 means no, 1 means yes) or by looking up the model (if it has a "Core Solo" or "Core Duo" CPU it's 32-bit only if it's a "Core 2 Duo" - note the "2" - it's 64-bit). Short answer: if your model of MacBook has a 64-bit capable CPU, you can run 64-bit apps under 10.5.8.
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