How can I associate a file type with a powershell script?

Question

I have a very powershell script that works perfectly and does:

Param(
  [string]$fileName
) 

echo \"Woo I opened $fileName\"

When I run it on

Answer 1

Here is a concrete answer tested under Windows 7 (but should work under 10 too). Open an administrative command shell and execute the following two lines once:

> assoc .ps1=Microsoft.PowerShellScript.1
> ftype Microsoft.PowerShellScript.1=%windir%\System32\WindowsPowerShell\v1.0\powershell.exe -File "%1"

Now PS1-files are executed by PowerShell 1.0 and not opened by Notepad anymore when double-clicked in the Explorer.