Redirection to a Dll in IIS 7

I am new to IIS 7 and Asp.net. I am trying to setup a website in IIS 7. In one of the aspx pages, the follwing code is present

function TestControl(){
var bIError = true;
try{
  var obj = document.getElementById("testObj");
  if (obj.Loaded == true)
  {
    bIError = false;
  }

And the corresponding html element is defined as follows .

<object id="testObj" name="ViewerObj" classid="Viewer.dll#ViewImage.ImageViewer"  width="100%" height="95%" VIEWASTEXT>

I have that .dll file and ViewImage is a name space in that viewer.dll . But When I try to browse, I am getting the follwing error IIS error

There is a problem with the resource you are looking for, so it cannot be displayed. Module IsapiModule Notification ExecuteRequestHandler Handler Isapi Error Code 0x8007007f

How can I fix this ?? How to handle requests to a dll in IIS 7 ??