A family of Microsoft word processing software products for creating web, email, and print documents.
I had the same issue when I updated my computer to Office 2013.
This is what I did and took care of it:
I opened Word (not in safe mode)
Click on File
Then click on Options
Under the General tab, items at the bottom of the list:
Under "Tell me if Microsoft Word isn't the default program for viewing and editing documents",
You will see: " Open e-mail attachments and other uneditable files in reading view".
Make sure you uncheck the selection, click OK, then close Word.
Then I try to open the file again (My issue was with files received via email), and it was no longer in reading mode. Hope this helps.
Nestor