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The PPTX Format
With Microsoft Office 2007, Microsoft introduced a new XML based file format called the Office Open XML (OOXML) document format. This new format is based on XML and has been adopted as an official standard for representing office documents like word processing files, spreadsheets, and presentations. These new files append an x to the end of the old Office file extensions, so PowerPoint files now have the .pptx extension. We read and write this format natively, which is why we give you the opportunity to download, email, and share presentations as PPTX files.
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PPT Format
Microsoft PowerPoint, usually just called PowerPoint, is a commercial presentation program developed by Microsoft. It is part of the Microsoft Office suite, and runs on Microsoft Windows and Apple's Mac OS X operating system. The current versions are Microsoft PowerPoint 2010 for Windows and 2011 for Mac.
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