Microsoft Office Compatibility Pack
Friday, December 15, 2006 at 04:43AM The Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats (whew!) will let you open, edit, and save the new default file formats created by Office 2007 programs (called Office Open XML, or OOXML) on your clunky old pre-2007 Office apps.
With the release of Vista just around the corner and Office 2007 hot on its heels, you can bet you’ll be seeing a lot more .docx (Microsoft Word’s new default filetype) and other OOXML files floating around. If you want to actually be able to read those files on your pre-2007 software, the Microsoft Office Compatibility Pack will take care of you. The pack is freeware, Windows only. — Adam Pash
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats [Microsoft]
Source: Download of the Day: Microsoft Office Compatibility Pack (Windows) - Lifehacker