Errr.....no, as Lil O'llady says, PPS files are PowerPoint Show presentation files, PowerPoint is a Microsoft application found in various versions of Microsoft Office for creating presentations - nothing directly to do with OpenOffice. If you just want to open and view a PPS file then all you need is to download the free PowerPoint viewer application from Microsoft here;
http://www.microsoft.com/downloads/details.asp x?********=048dc840-14e1-467d-8dca-19d2a8fd748 5&displaylang=en
This will allow you to open and look at PPS files (PowerPointShow) but NOT to make PPS files for yourself.
Open Office is a full suite of applications (Word Processor, Spreadsheet, Presentations) - just like Microsoft Office - only free, which allows you to create (and view) files in various formats. The OpenOffice presentation program will open PPS files made by PowerPoint (which is Microsoft).