@infoT7QWV What does "file becomes unrecognisable" mean to the rest of us way over here?

For example, where and how does that error appear, how do we all try to repeat what you see?

Is this just you or everyone accessing the Windows Server folder in your office see this error (and in what form does it appear, and how)?

So far, from your light post, you have an I.T. issue, nothing more, we can't help you with local I.T. issues.