In Microsoft Office 2007 and 2010, the extension is .pptx, whereas in earlier versions it was .ppt.
The default file name is Presentation 1 The default file extension is .pptx
I believe the default is .pptx (The old default used to be .ppt)
.ppt is the file extension for power point files
You are referring to the the extension. For Powerpoint it is PPT and XLS is used by Excel.
It is the extension used for PowerPoint presentations up to PowerPoint 2003. From PowerPoint 2007 onwards, it uses .pptx instead.
.ppt
.pps and ppsx (for Powerpoint 2010)
color
title
.png is the default extension of an Ms-paint file
"Docx" is the default file extension for Word 2013 edition.
Normal view is the default view.