cannot detect already loaded referenced assembly

Before enter, sorry for my bad english...

I am making some program that need to implement plugin structure. Loader.exe is a main application, Plugin.dll is a plugin class library. Plugin.dll requires Depend.dll.

I want to forcing load Depend.dll in specific path, without GAC or appdomain base directory, etc. I preload the Depend.dll using Assembly.LoadFile before load Plugin.dll, but assembly cannot detect loaded assembly-Depend.dll. It throws System.IO.FileNotFoundException at Plugin.Start().

Is it possible to preload referenced assembly without adding event handler to AssemblyResovle?

I cannot use AssemblyResolve handler.

Depend.dll

using System;

namespace Depend
{
    public class Hello
    {
        public void World()
        {
            Console.WriteLine("Hello, world!");
        }
    }
}

Plugin.dll

using Depend;

namespace Plugin
{
    public class Plugin
    {
        public void Start()
        {
            new Hello().World();
        }
    }
}

Loader.exe

string path = Environment.CurrentDirectory;
Assembly.LoadFile(Path.Combine(path, "..\\Depend.dll"));
Assembly asm = Assembly.LoadFile(Path.Combine(path, "Plugin.dll"));

Type typ = asm.GetType("Plugin.Plugin");
typ.GetMethod("Start").Invoke(Activator.CreateInstance(typ), null);