Hello ,
Thanks for your answer.
As I already said, the files are not corrupt, they can be opened in other computers with LibreOffice and also using Excel in the mentioned PC with Windows 11.
I am afraid the problem was triggered after I installed MS-Office on this new machine. I could use LibreOffice for several days before yesterday.
This is the only PC with Windows 11 that I have, brand new, assembled by myself one month ago. MS-Office was the last thing I remember was installed before the issue.
I attached here one of the files, anyway.
Thanks,
Armando
RSD_OncoCare.ods (153 KB)