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

Use the proper tools for the job:

cmd /c assoc .fob=foobarfile
cmd /c ftype foobarfile=powershell.exe -File `"C:\path\to\your.ps1`" `"%1`"

Note that both assoc and ftype are CMD-builtins, so you need to run them via cmd /c from PowerShell.

For files without extension use this association:

cmd /c assoc .=foobarfile