My laptop came with a trial version of Microsoft Office Home and Student 2007. After the 60 day trial period expired, I installed the latest version of Open Office. I believe that .pps files should work with Open Office(?) Ever since I uninstalled Microsoft Office, I have not been able to open .pps files in my Windows Mail emails because I need to 'create a file association'. I tried to do that, but the pps extensions are not listed. What should I do so that I can open .pps files in my emails? My OS is Windows Vista Home Premium. Thanks.