For those of you using Office 2007 it may be worth changing the default docx to doc. I know others can download the extension but the time saved in one person doing below versus all those other people downloading the extension and installing it seem to outway the use of an new extension that does not seem to offer much for the average user?

"Sharing Office 2007 Documents with Users of Older Versions of Office If you know that you will be sharing Office 2007 documents with someone using an older version of Office, you can save the document in a compatible format by selecting the Office Button > Save As > Tools > Save Options. Then set the file format drop down window to .doc."