Extension: ppt
What is it? PowerPoint Presentation File
Where’s it from? Microsoft PowerPoint graphics presentation program. Many “entertaining” ppt files are passed around via email. Virtually identical to the Microsoft PowerPoint Slideshow format (pps). In fact, you can rename a pps file to a ppt file and vice versa, and it will still play. The difference is that when you double-click on a ppt file it opens in PowerPoint’s editing mode, while a pps file opens in slideshow mode and begins playing.
How do I use it? Microsoft Office; Windows (free): OpenOffice; Web-based: Zoho.
Can I safely delete or move it? Yes.
Can it be dangerous? Yes. Use antivirus software, especially on email attachments
— David Hakala