Microsoft Office 2007 features a new file type .docx.

If you don’t have Microsoft office 2007 and you have received a .docx file or perhaps downloaded one, here are a few tips on how to open it.

If you already have a different version of Microsoft office, such as 2003, then you can simply download a compatibility pack from the official Microsoft website.

If you have microsoft office 2003 or 2000, then you can download an update via this link
If the link does not work try searching for “Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats”, on the Microsoft website.