Although LabVIEW seems to know what version it was previously in, (it
shows this information when you close a VI without saving and it
promts you to save, you can click 'Explain' and it says it was in a
previous version and what that version was) I don't think you can get
that version number through a property node or any other means. This
is probably due to the fact that as soon as you open a VI that was
saved in a previous version, it recompiles it to the current version.

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