lost data when opening excel workbooks ; text import wizard popup

C

craig l

When opening many of my excel files ,which all have the same modification
date, I come across the text import wizard which states that my text in these
files is 'delimited'. All of the files ,including a few word doc.s have had
their data changed to show all " y " with two dots above the letter for as
far as the eye can see. No import or export has been done with the files and
no modifications were done on that date, as far as I know.
Is this a corruption problem or is their some 'fix' that I am overlooking.
Thanks for any ideas.
 
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