Get ProductCode value from a specific msi file.

gistfile1.js

var msi = new ActiveXObject("WindowsInstaller.Installer");
var msiOpenDatabaseModeReadOnly = 0;

var db = msi.OpenDatabase("test.msi", msiOpenDatabaseModeReadOnly);
var view = db.OpenView("SELECT * FROM Property WHERE Property = 'ProductCode'");
view.Execute();
for (var r = view.Fetch(); r != null; r = view.Fetch()) {
  WScript.Echo(r.StringData(1) + "=" + r.StringData(2));
}
view.Close();

gistfile2.cs

using Microsoft.Deployment.WindowsInstaller.Linq;
using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        using (var db = new QDatabase("test.msi"))
        {
            var prop = db
                .Properties.Where(i => i.Property == "ProductCode")
                .AsEnumerable()
                .First();
            Console.WriteLine(prop.Value);
        }
    }
}