if you have an office version that can open it then use save as and select the word 97-2003 format (xls).
You can do the same thing with the libre office (evolved open office) which is free.
if you use office 2003 and want to convert office 2007 document, you need download **broken link removed** to open it on office 2003 then save it as office 2003 format.
Converting the word file 2007(.docx) to the word file 2003(.doc), to do this click on the Microsoft office top left corner MS word and how over save as, and click on 2003 document. This is save file by the .doc.