Office 2007 which is to release sometimes on 2007 will have two major changes to the office file format. First, Microsoft will have file extensions with more than 3 characters for the first time and it will move from the well know .doc, .xls and .ppt file extensions.
Office 2007 will have a new, XML-based file format for Microsoft Word 2007, Microsoft Office Excel 2007 and Microsoft Office PowerPoint 2007. Office 2007 will also support export to PDF.
Below is the list of new file formats
Word 2007 Supported File Formats
* Word Document (.docx) – Default format
* Word Macro-enabled Document (.docm)
* Word Template (.dotx)
* Word Macro-enabled Document Template (.dotm)
Excel 2007 Supported File Formats
* Excel Workbook (.xlsx) – Default format
* Excel Macro-enabled Workbook (.xlsm)
* Excel Template (.xltx)
* Excel Macro-enabled Workbook Template (.xltm)
* Excel Binary Workbook (.xlsb)
* Excel Add-in (.xlam)
PowerPoint 2007 Supported File Formats
* PowerPoint Presentation (.pptx) – Default format
* PowerPoint Macro-enabled Presentation (.pptm)
* PowerPoint Slide Show (.ppsx)
* PowerPoint Macro-enabled Slide Show (.ppsx)
* PowerPoint Template (.potx)
* PowerPoint Macro-enabled Presentation Template (.potm)
* PowerPoint Add-in (.ppam)
Not all file formats will be backward compatible only the following formats will be backward compatible down to Office 2000.
* Word Document (.docx)
* Word Macro-enabled Document (.docm)
* Excel Workbook (.xlsx)
* Excel Macro-enabled Workbook (.xlsm)
* Excel Template (.xltx)
* Excel Macro-enabled Template (.xltm)
* Excel binary Workbook (.xlsb)
* Excel Add-in (.xlam)
* PowerPoint Presentation (.pptx)
* PowerPoint Macro-enabled Presentation (.pptm)
* PowerPoint Slide Show (.ppsx)
* PowerPoint Macro-enabled Slide Show (.ppsm)
* PowerPoint Template (.potx)
* PowerPoint Macro-enabled Presentation Template (.potm)
