Thaanks for your efforts guys.
Mr: 504bloke.
The zipped resaved files that you sent contain only the 16zone, these are the files that I have been able to access without problems. Could you send me back resaved files for the Die_heat to see if once these have been resaved I can open them and make changes.
My version of PB32 is 3.81 Build 316
All attempts to save the files as PB32 or PB2.6 PVA or PBA files results in the same save failed.