If you want to read the revision of a LabView VI, you can use some functions from the Application Control function palette.
Open VI Reference has an input for the VI path. Its output is a VI reference. Wire that reference to a property node (also on the Application Control palette). Right-click on the property node and select Properties >> History >> Revision Number. Browse the other properties for anything else of interest. Call Close LV Object Reference (from the Application Control palette) when you're done.