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Office 2008 Technical Reference
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About Open XML Formats
Open XML Formats are the new default file formats for Word 2008, Excel 2008, and PowerPoint
2008. They are also the default file formats for the 2007 Microsoft Office system for the Windows
operating system. The new formats create smaller files that take up less space than the previous
formats, and they also make it easier to recover damaged files and share files.
For more information about how to open a file that is in a different file format, see "Open a file
that is in a different format" in Word 2008 Help. For more information about how to save a file to
a different file format, see "Save a document in a different format" in Word 2008 Help.
The default Open XML file name extensions for Office 2008 include the following:
Application File Type
File Name
Extension
Description
PowerPoint
2008
PowerPoint
Presentation
.pptx The default, XML-based presentation format
for PowerPoint 2008 for Mac and PowerPoint
2007 for Windows. Cannot store VBA macro
code.
PowerPoint
2008
PowerPoint
Template
.potx Saves the presentation as an XML-based
template that you can use to start new
presentations. Saves presentation settings such
as fonts, color schemes, slide layouts, and
graphics.Cannot store VBA macro code.
PowerPoint
2008
PowerPoint
Show
.ppsx Saves as an XML-based presentation that
always opens in slide show view. Compatible
with PowerPoint 2008 for Mac and PowerPoint
2007 for Windows.
PowerPoint
2008
PowerPoint
Macro-Enabled
Presentation
.pptm The XML-based presentation format that
preserves VBA macro code. VBA macros do
not run in PowerPoint 2008.
PowerPoint
2008
PowerPoint
Macro-Enabled
Template
.potm Saves the presentation as an XML-based
template that preserves VBA macro code.
Saves presentation settings such as fonts, color
schemes, slide layouts, and graphics.VBA
macros do not run in PowerPoint 2008.