That's right, if you have a backup of the original LabVIEW operator interface directory, that project could be opened in LabVIEW 8.2 without any problems, but if you have made and saved all of your changes in LabVIEW 8.5, then you will have to save the project for a previous version using LabVIEW 8.5 Project Explorer. Go to File
»Save for Previous Version.
Regards,
Marty H.
National Instruments