For some reason Microsoft made the standard Office 2007 Word documents .Docx. There are 2 ways to correct this issue. You can download Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats. That can be found here.
The alternative to this is to avoid saving files in .Docx. To do this Open Office 2007 and go to File –Save As- then choose Save As type: 97-2003. By doing doing this, you are now able to open 2007 documents in office 2003 and 2000.
