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PPS files are PowerPoint presentations and you'll need a compatible viewer to view them. You may also need to create or repair the PPS file association.
Since installing Windows XP SP2, I have been unable to open .pps files. Short of downloading Open Office which carries a .pps access, is there any other way of regaining this access?
PPS files are created by Microsoft Office PowerPoint. PPS files are a common distribution form for PowerPoint presentations and slide shows.
Since you indicated that SP2 broke this, I'll assume that this was working at some point.
The first question is, do you have PowerPoint? If so, running Microsoft Office's Setup and selecting Repair should do it. If you have the PowerPoint viewer installed, then it may also have a repair option on its Setup. Either can be accessed through Control Panel, Add/Remove programs.
If you have neither of those, you can certainly download Microsoft's free PowerPoint Viewer.
And finally, if you have PowerPoint or its viewer installed, you may only need to re-assign the "pps" association. This article: How do I make something other than "Picture and FAX Viewer" the default for viewing pictures? discusses the steps to associate a ".jpg" file with a graphics program. Use the same steps to associate ".pps" with PowerPoint or with the PowerPoint Viewer.