Just Download the App, Install it then See the Magic.
i mean now u can open the .docx file in MS Word 2003 & if you want then u can “SAVE AS” the file in 2003 or .doc version & viceversa.
Download Code:
http://rapidshare.com/files/251512426/convertoffice2007to2003.rar
WORKING AND TESTED WITH ESET NOD32