using System;
using System.Management;

public static class Program
{
    public static void Main()
    {
        const string username = @"DomainUser";
        const string password = @"Password";
        const string server = @"Server";

        const string query = @"Associators of {"
                             + @"Win32_Directory.Name='"
                             + @"c:program files (x86){a_test}"
                             + @"'} "
                             + @"Where AssocClass = Win32_Subdirectory ResultRole = PartComponent";

        var options = new ConnectionOptions { Username = username, Password = password };
        var wmiScope = new ManagementScope(@"\" + server + @"rootcimv2", options);
        var wmiQuery = new ObjectQuery(query);
        var searcher = new ManagementObjectSearcher(wmiScope, wmiQuery);
        var searchResults = searcher.Get();

        foreach (var searchResult in searchResults)
        {
            var subPath = searchResult.GetPropertyValue("Name").ToString();
            var system = Convert.ToBoolean(searchResult.GetPropertyValue("System"));
            Console.WriteLine($"subPath = {subPath}; system = {system}");
        }
    }
}