Installing the Microsoft Compatibility Pack
1. Close out of all office products (word, excel, outlook, etc)
2. Go to //www.microsoft.com/downloads/details.aspx?FamilyId=941B3470-3AE9-4AEE-8F43-C6BB74CD1466&displaylang=en
3. Click the Download button
4. When it asks you to Save or Run, click Run.
5. When it is complete, click on Open
6. Click the box to accept the agreement, and click Continue
7. It will then go through the install process.
8. Click Ok when it is complete.
9. You should not have to restart for this to take effect.
10. You should now be able to open the document in question.