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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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SWF Format
The SWF (pronounced 'swiff') file format was designed from the ground up to deliver graphics and animation over the Internet. The SWF file format was designed as a very efficient delivery format and not as a format for exchanging graphics between graphics editors. It was designed to meet the following goals:
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