What is the new “Open Office XML” file format about?
Both Office 2008 and Office 2007 create documents using a new file structure called “Open Office XML”. This new file format creates smaller files (up to 75%), makes it easier to recover damaged files, and makes it much easier to share files with Office 2007 (for Windows) users. By default, newly created documents will be saved in the new format. The extension to the filename will be the traditional three characters—plus an “x” to distinguish it from earlier versions. In Office 2008 Word documents will be .docx, Excel spreadsheets will be .xlsx, and PowerPoint files will be pptx.
