About a week ago I was unable to open an attached file. Format doesn't matter. pdg, xls, mp4, etc. Noner will open. This problem has been discussed many times on various Internet webisties, but none of the fixes I found worked. I am using the same hardware and software for years without a problem. I even tried disabling security (one of the recommendations) but that did not work. I can save an attached file and open the saved file so the files themselves are not corrupted. I've read that this is a problem of Windows not the email client, thus giving the Windows 10 forum a chance to solve the problem. Any ideas?