Recently, just throw all of systems and software upgrade, the system reached the office also upgraded to Windows server2012 office2013, but a strange question, is what I had written in office2010 doc document, use office2013 to open it, at first thought that the document is broken, get on my friend’s computer (I give him a pack is an), his computer can normal open the my documents, So I wonder if my new system is missing some DLL-Files.com DLL or something, but I have checked my COMPUTER DLL-Files.com software.
After struggling with baidu for a long time during the day, I finally found the problem, which was still in the setting of Office (because it was the setting that could not be accessed by the unsafe files of Office 2013, it was just my personal idea).
 
Solutions:
Open any office document and select File

Then select Options from the content called out

A new Settings screen will be brought up. For example, select the Trust Center option and click on Trust Center Settings on the right.

At this time, there is a new interface, as follows:

Let’s select Protected View, remove all the check marks, confirm the application, and then reopen the document that we couldn’t open. What do you find?Ha ha

Reproduced in: https://www.cnblogs.com/Jimmy009/archive/2012/09/10/2679534.html