The file extension for PowerPoint file is:

Correct Answer: .ppt

The .ppt extension is used for Microsoft PowerPoint presentation files created in PowerPoint 97–2003. Starting with Microsoft Office 2007, the default presentation file extension changed to .pptx.

Why the other options are incorrect:

• PPT.exe: This is not a valid PowerPoint presentation file extension.
• MSPPT.exe: This is not a standard Microsoft PowerPoint file or executable name.
• Powerpnt.exe: This is the Microsoft PowerPoint application executable, not a presentation file.
• None of these: The correct presentation file extension is .ppt (or .pptx in modern versions).