First of all thank you very much for helping me.

I did as you told me for the flat file and in fact there were 55 rows with problems, 54 of which had in common a letter which exists in my language , it is the letter Ç. One of them had another letter

like A but with a sign over.

Well I have to accept that I had been mistaken for the presence of such characters.

The problem now is that when I use the option ignore failure, these rows come but the leter Ç is

substituted with an ?

Do you have any idea how can I solve this?

Thank you very much!