Load a com DLL in c#

I want to load a COM dll dynamically in c# console application.

Till now I have tried the following code:

// load exe with args as EXE DllName classNameTobeLoaded
try
{
 // load assembly
 Assembly Dll = Assembly.LoadFile(@"C:\My_Dir\TestComDll.dll");
 // get the type names
 foreach(Type t in Dll.GetExportedTypes())
 {
   dynamic vClassLoaded = Activator.CreateInstance(t,"Test");
   Console.WriteLine("Type Loaded");
 }

  Console.WriteLine("DLL is loaded");
}
catch (Exception ex)
{
  Console.WriteLine("Unable to load a DLL because \n" + ex.Message);
}

But while loading the dll I am getting error as:

{System.BadImageFormatException: The module was expected to contain an assembly manifest. (Exception from HRESULT: 0x80131018)
   at System.Reflection.RuntimeAssembly.nLoadFile(String path, Evidence evidence)
   at System.Reflection.Assembly.LoadFile(String path)
   at ThirdPartyDLLLoader.Program.Main(String[] args) in h:\Test Exe\ThirdPartyDLLLoader\ThirdPartyDLLLoader\Program.cs:line 18}

The same code is working fine for .NET DLL.

Can any one tell me why the code is not able to load a COM dll dynamically?

and if it is not can you please tell me how I can do the same.

Thanks for any suggestion and help.

This cannot be done. The Assembly.LoadFrom method is for loading .NET assemblies. COM library must be registered and then you can instantiate classes using Activator.CreateInstance method.

This is how I access MS Word:

Type type = Type.GetTypeFromProgID("Word.Application");
object obj = Activator.CreateInstance(type);