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I downloaded iTunes 9.0.3 (64-bit) on my Windows 7 64-bit OS and I noticed that on installation the default directory was \Program Files (x86). I didn't change this, everything worked a charm.
Nevertheless, I'm curious if this means it's working in a "legacy mode" (32-bit) without taking advantage of the 64-bit OS. Looking in the two separated "Program Files" folders (both 32-bit and 64-bit) I see there are iTunes subfolders inside, although the bulk of the program resides on the x86 one. Is this normal?
Is it critical to install something on the \Program Files (64-bit) folder when you know you have downloaded a 64-bit version of the program? Does the OS know how to recognize 64-bit-capable programs alone? Is there a way to know my iTunes works in 64-bit mode?
You'll find a lot of applications installing to the Program Files(x86) folder. Anything that installs there is a 32-bit app. I switched from 64-bit to 32-bit Windows 7 because all of the apps that I'm running are available in 32-bit native, and very few are 64-bit native. But the Windows 7 handling of the 32/64 bit environment was quirky enough that I didn't really like it. Had I needed 64-bit for memory support, I would have dealt with it, but I didn't. – Joe Internet – 2010-02-09T00:30:47.460