ValPopescu
The data sets and metafile I have worked fine in the previous Cal Tool 4.1 but not now. The computer has the latest windows 10
What should I try?
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littleozfella
'Have you installed and activated the Personality?  If you already have a dataset you don't really need a metafile, but you could try activating the metafiles
  .MENU    Tools, Import metafiles
 What message do you get when you try to open a dataset?

Cheers
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ValPopescu
Yes I activated the personality file but what I did next is still unexplained. Initially  I installed 4.2 as an update (or repair as the message said)  to 4.1 but later  I un-installed 4.1 and reinstall 4.2 as as a new program. After that all worked perfectly. My guess is the "repair" did  not install (or removed) some needed files and hence the problem. Just speculation at this time. 
Thanks
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