Leopard added the ability to run 64-bit Cocoa, and to some extent Carbon, applications (it was possible to run non-Cocoa/Carbon 64-bit apps as of 10.4; for example, command line apps). But you might now be curious if any of your Cocoa GUI applications in Leopard actually are compiled to take advantage of 64-bit addressing. To find all Applications that are compiled for 64 bit is pretty easy. In Terminal, type either the Intel or PowerPC command below (the line without the leading #):# For Intel:locate -0 app/Contents/MacOS/ | xargs -0 file | grep x86_64# For PowerPC:locate -0 app/Contents/MacOS/ | xargs -0 file | grep ppc64On my system, I had seven 64 bit GUI apps (all apple ones in fact: Xcode, Chess, Java, Quartz Composer,etc). Just to clarify a bit: A 64-bit application only means that that single application can access more than 4GB of memory (which i...

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