.PS1 File Extension
File Type 1Windows PowerShell Cmdlet File
What is a PS1 file?
Script, or "cmdlet," used by Windows PowerShell, a Windows shell program built on Microsoft's .NET Framework; contains a series of lines written in the PowerShell scripting language; similar to a .BAT or .CMD file, but executed by Windows PowerShell instead of the Windows CMD.EXE and COMMAND.COM programs.
Cmdlets can be used to automate Windows tasks. For example, a cmdlet may rename a group of files to use a new file extension. Another cmdlet may examine the Windows registry and output results to a file. Cmdlets also support aliases, pipelines, and named and positional parameters for commands.
Windows PowerShell is installed by default on Windows 7.
NOTE: Be careful when executing PS1 scripts since they may contain functions that access critical Windows operating system components.
File Type 2Microsoft Indexing Service Data File
This file is saved in a binary format, which requires a specific program to read its contents.
.PS1 File Association 2
System file created by Microsoft Windows' Indexing Service feature, which creates an index of searchable file information; commonly created in the C:\System Volume Information\catalog.wci\ directory and contains data that helps the operating system perform quicker searches.