what extension is used for powerpoint
PowerPoint File Extensions. The file extension for a PowerPoint show is .ppsx (versions 2007 or 2010) or .pps (versions 2003 and earlier). The file extension for a PowerPoint presentation is .pptx (versions 2007 and 2010) or .ppt (versions 2003 and earlier). This file extension tells PowerPoint whether the file is ready for prime time (a PowerPoint show) or is still in the creation stage (a PowerPoint presentation).
As you may have guessed, save your work as a .potx file for use in PowerPoint 2007 and newer, as a .potm file for a 2007 or newer macro-enabled presentation, and as a .pot file for use on PowerPoint 97 through 2003.