Some of my clients after the last update of Windows 10 began to send
that they can not now save changes to protected files (Files/Save).
Before this, there were no such problems.
The number of appeals is growing, and I do not know what to do about it.
Excel gives a message like this:
Format of the file FS17A400. does not match its extension. File may be damaged or unsafe. Open it if and only if you trust the source of the file.
Are you sure you still want to open this file ?
After you click Yes, the table closes and Windows tries to fix the problem.
We tried to disable Antivirus and the defender of Windows. But nothing
helps. But in fact everything worked before the update!
Previously, there were no such problems. I’m worried that the number
of appeals is growing and all of them are related to the update. How
can this problem be solved ?