Multiple versions of Microsoft PowerPoint can co-exist on the same machine if you install them in the order of release. Between Microsoft PowerPoint 2010/2007 and Microsoft Office PowerPoint 2003, install PowerPoint 2003 before PowerPoint 2010/2007. While installing PowerPoint 2010/2007, ensure that you tell the installer to keep the existing PowerPoint 2003 and not delete/overwrite it. After installing PowerPoint 2010/2007, it will take over opening all presentation files including .pptx, .pptm, .ppsx, .ppsm, .potx, .potm, .ppt, .pps, .pot. The following steps will make PowerPoint 2003 associate .ppt, .pps, .pot file extensions with itself while keeping the PowerPoint 2007-specific file formats (.pptx, .pptm, .ppsx, .ppsm, .potx, .potm) for PowerPoint 2007:
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