This is Bryan from the Office team. We are extremely sorry to learn that some of you are running into an issue with Office after upgrading from Windows 7 to Windows 10 where some of your Word, Excel and PowerPoint documents are failing to open with various error messages, such as:
- Word: “Word experienced an error trying to open the file”
- Excel: “This file is corrupt and cannot be opened”
- “The application was unable to start correctly"
- “PowerPoint found a problem with <filename>"
- “Sorry, PowerPoint can’t read <filename>"
[UPDATE - 8/25/2015]
On Monday, a fix went out to all Office 2013 Click-to-Run users that fixed the Protected View issue that was preventing some files from opening. For those users, the Office applications would launch and even creating new documents worked fine; however, opening some files resulted in various error messages like above. If you haven't already been prompted to install the August update, you can manually trigger by going into an Office application like Word, then select File > Account > Update Options > Update Now.
There are other known issues that could also cause similar error messages, but those are not related to the specific Protected View issue. Teams are working hard to determine the root cause and resolve those issues. For instance, if you are running Windows 10 and Office is running in Windows compatibility mode for a prior version, you likely will also experience issues.
We apologize for the inconvenience caused due to this issue!