Then you'll need to do as I've already suggested "... replace that extent ... copying "Windows XP Professional-000012-s013.vmdk" (because it's an empty extent) to "Windows XP Professional-000012-s007.vmdk" so have a look at: 
Work with Virtual Machine Packages
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Re: Error Message Unable to open file "/Users/GreggPC/Documents/Virtual Machines.localized/Windows XP Professional.vmwarevm/Windows XP Professional-000012.vmdk"
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