If you have upgraded from Windows 7 to Windows 10, you may find that some of your Office 2013 documents result in errors when you try to open them in protected view using a Click-to-Run install of Office. Protected View can occur when opening files from locations that may pose a threat such as Outlook or the internet. Errors: Excel: "This file is corrupt and cannot be opened" Word: "Word experienced an error trying to open the file" PowerPoint: "Sorry, PowerPoint can't read <file name>" For more on Protected View, refer to https://support.office.com/en-us/article/What-is-Protected-View-d6f09ac7-e6b9-4495-8e43-2bbcdbcb6653?CTT=1&CorrelationId=e345befc-508c-4b7d-9e6e-1ca7115fed91&ui=en-US&rs=en-US&ad=US This issue is being investigated. The KB article below includes steps to resolve the issue: Error opening Office documents after upgrading to Windows 10 https://support.microsoft.com/en-us/kb/3086786
