PowerShell の実装は、ファイルを開くデフォルトのアプリケーションを照会する

$Source = @"
 
using System;
Text;
Runtime.InteropServices;
public class Win32API
  InteropServices; public class Win32API {
    [DllImport("shell32.dll", EntryPoint="FindExecutable")]
 
    public static extern long FindExecutableA(string lpFile, string lpDirectory, StringBuilder lpResult);
 
    public static string FindExecutable(string pv_strFilename)
    {
      StringBuilder objResultBuffer = new StringBuilder(1024);
      long lngResult = 0;
 
      lngResult = FindExecutableA(pv_strFilename, string.Empty, objResultBuffer);
 
      if(lngResult >= 32)
      {
        return objResultBuffer.ToString();
      }
 
      return string.Format("Error: ({0})", lngResult);
    }
  }
 
"@
 
Add-Type -TypeDefinition $Source -ErrorAction SilentlyContinue
 
$FullName = 'c:\Windows\windowsupdate.log'
$Executable = [Win32API]::FindExecutable($FullName)
   
"$FullName will be launched by $Executable"