You will need to download the free Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007/2010 File Formats
http://www.microsoft.com/en-us/download/details.aspx?id=3http://office.microsoft.com/en-us/word-help/open-a-word-2010-document-in-an-earlier-version-of-word-HA010370115.aspxOpen, edit, and save documents, workbooks, and presentations in the file formats new to Microsoft Office Word, Excel, and PowerPoint 2007.
To install this download:
1. Ensure your system is up to date by installing all High-Priority/Required updates on Microsoft Update (required for Microsoft Office XP and 2003 users).
2. After installing all High-Priority/Required updates with Microsoft Update, download the Compatibility Pack by clicking the Download button above and saving the file to your hard disk.
3. Double-click the FileFormatConverters.exe program file on your hard disk to start the setup program.
4. Follow the instructions on the screen to complete the installation.