Microsoft Office 2013 Compatibility Pack
Word, Excel, and PowerPoint File Formats
To open a Microsoft Word 2013 .docx or .docm file in Word 2010 or 2007, you don’t need to do anything extra. Just open the file.
Install this compatibility pack if you want to modify or view any document created with Microsoft Office 2013, Microsoft Office 360 in any previous version of Microsoft Office like XP, 2000, 2002 and 2003
Install this compatibility pack if you would like to open, edit, and save documents, workbooks, and presentations that were created in the newer versions of Word, Excel, and PowerPoint. Scroll down to see instructions and system requirements.