open Microsoft.docx files

when i went to my hometown last month a friend of mine confronted with a problem .He asked me to write a application for him.I wrote the application using microsoft 0ffice 2007 and gave it to him .He was having microsoft 2003 so the file failed to open in his computer.Then he called me and i gave the following solution

download the firefox plugin Open XML Viewer .he then opened the file without any software update.