File Type Microsoft PowerPoint Open XML Document
Category Data Files
File Description Presentation format introduced with Microsoft PowerPoint 2007 (part of Office 12); stores slides used for slide shows or presentations; may include text, images, and other media; based on the Open XML format and uses ZIP compression for smaller file sizes.
Backwards compatible with Microsoft Office 2000, Office XP, and Office 2003 via component support.
Program(s) that open pptx files
Mac OS Mac OS Microsoft Office Open XML File Format Converter
Windows Windows Microsoft PowerPoint 2007
Microsoft Office 2007 packagingMicrosoft has released free Word & PowerPoint viewers to enable computer users to read documents created by the latest version of Microsoft Office, 2007.
Microsoft Office 2007 uses a new Office Open XML format that is not understood by previous versions of the software. Word documents now carry a .docx extension and PowerPoint presentations have become .pptx files. Computer users who do not own Microsoft Office can now view these kinds of documents using one of the following free downloads:
* Word 2007 Viewer for docx files
* PowerPoint 2007 Viewer for pptx files
Alternatively, users of Microsoft Office XP and 2003 can view, create, edit, and save documents in these new formats by installing the Microsoft Office Compatibility Pack.
Source: Digital Inspiration.