.pps and ppsx (for Powerpoint 2010)
yes or no
A .ppt file is a file to be used in the Microsoft PowerPoint software.
PPT is usually a Microsoft PowerPoint file.
.pptx
.ppt is the file extension for power point files
.ppt for versions up to 2003 and .pptx from version 2007 onwards.
The default file name is Presentation 1 The default file extension is .pptx
There are a few: .pot--PowerPoint 97 to 2003 template file .potx--PowerPoint 2007/2010 Open XML presentation template file .pps--PowerPoint 97 to 2003 complete slide show file .ppsx--PowerPoint 2007/2010 Open XML complete slide show file .ppt--PowerPoint 97 to 2003 Presentation file .pptm--PowerPoint 2007/2010 macro-enabled Open XML presentation file .pptx--Microsoft PowerPoint 2007/2010 Open XML presentation file
.pptx is for Pwerpoint 2007 and onwards, including Powerpoint 2013.
The .PTX file extension is used as a Court Reporter Transcript file or as RAW file generated from a Pentax camera
You are referring to the the extension. For Powerpoint it is PPT and XLS is used by Excel.
File > Save or File > SaveAs