Sometimes PanelBuilder files can be saved in a very old format, from PanelBuilder 2.6 (which was a Windows 95 edition). Because this file is for a terminal that didn't exist then, it can't be saved in that format.
You have to upgrade your PanelBuilder32 software to version 3.82.
PanelBuilder32 is included in all Tech Connect support contracts. If you don't have a support contract, call your local RA distributor or RA sales office and see if they can help you.