Computer files with the extension PPSX are Powerpoint presentations. What sets these apart from Powerpoint presentations with the PPS suffix is that these were created in Microsoft Office 2007.
All Microsoft Office files created in the 2007 version feature an X in their suffix, differentiating them from their pre-2007 brethren. The X refers to XML, or extensible markup language. Microsoft included XML coding for its Office 2007 documents to improve collaboration between individuals.
Microsoft adopted the Office Open XML coding for its Office 2007 edition to keep up with competing products. Software such as OpenOffice, Google Docs and Apple's iWork suite had already used open-source XML code in their documents.
PPSX documents are up to 75 smaller than PPS files created in previous Microsoft Office versions. Microsoft Powerpoint 2007 compresses its documents upon closure to ensure transportability and easy sharing across email or the Internet.
A PPSX file has better security features than files created in older versions of Powerpoint. Each area of data is saved and stored separately. For example, a slide with a graph, a picture and a text box is saved in four different parts. The slide's appearance is one file, the graph is saved as another, the picture is third and the text box is the fourth. This way, if the chart or photo becomes corrupted, the rest of the document remains safe.
Files ending in PPSX cannot be opened in versions of Microsoft Powerpoint earlier than 2007. Microsoft has written a file format conversion tool to facilitate the easy transfer of files between versions. Users of Powerpoint 2007 also have the opportunity to save their document as a Powerpoint 97-2003 file, which can be opened by older versions of the software.
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