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It's the OS. OSX has long been capable of moving files that are in use. As I recall, the move is simply adjusting a pointer in the file system. The actual contents stay where they are (as expected).
However this won't work if you move the file to a different device since the OS has to physically move the bytes.
That said, apps need to be aware of this. If they cache the file's path then close and reopen the file at the cached path, you'll get an error. They can monitor the file system for move events.
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stevepa
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