From: "Diane Poremsky [MVP]"

| *.ps1 extension is used for powershell scripts. It can be viewed in notepad
| and should preview if associated with the text previewer.

Alternatively...
http://filext.com/file-extension/PS1


--
Dave
http://www.claymania.com/removal-trojan-adware.html
Multi-AV - http://www.pctipp.ch/downloads/dl/35905.asp