Extension: pps
What is it? PowerPoint Slideshow
Where’s it from? Microsoft PowerPoint graphics presentation program. Many entertaining (?) PowerPoint files are passed around via email.
How do I use it? Windows: 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