I'm not sure why you'd need to inspect the file, Lightroom is telling you that it was edited with PV2003. And it could have been edited with LR 3, 4 or 5 with PV set to PV2003.
But if you really want to, the EXIF data in the file should indicate a Process Version (although I'm at work right now so I don't really know the details of what to look for)