Office 2007 File Converter Pack

Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats
Docx,

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Instructions

Users of the Microsoft Office XP and 2003 programs Word, Excel, or PowerPoint—please install all High-Priority updates from Microsoft Update before downloading the Compatibility Pack.

By installing the Compatibility Pack in addition to Microsoft Office 2000, Office XP, or Office 2003, you will be able to open, edit, and save files using the file formats in newer versions of Word, Excel, and PowerPoint . The Compatibility Pack can also be used in conjunction with the Microsoft Office Word Viewer 2003, Excel Viewer 2003, and PowerPoint Viewer 2003 to view files saved in these new formats.

How to Convert File to Older Version 

bring your mouse on the file you want to convert then right click on the file and from the menu select save ass or save and your file will be converted to older version Simple