Class Not Registered With RMO And X64 Windows

I have a small .net application that uses RMO to synchronize a merge subscription. Everything works fine when I build with platform target = "Any CPU" on both x86 and x64 systems, but I get a "Class not registered" error on my x64 system when the application is built with platform target = "x86". Incase you are wondering I have to run this code under x86 because it is actually going to distributed in a dll and called from an x86 application.

x64 System:
Microsoft Windows Server 2003 R2
Enterprise x64 Edition
Service Pack 1

Here is my code:

{
ServerConnection dbconn = new ServerConnection(publication_server);
dbconn.LoginSecure = true;
dbconn.Connect();

MergeSubscription subscription = new MergeSubscription();
subscription.ConnectionContext = dbconn;
subscription.DatabaseName = publication_db;
subscription.PublicationName = publication_name;
subscription.SubscriberName = subscription_server;
subscription.SubscriptionDBName = subscription_db;

if (!subscription.LoadProperties() || subscription.SubscriberSecurity == null)
throw new Exception("Unable to initialize the Synchronization");

MergeSynchronizationAgent agent = subscription.SynchronizationAgent;
agent.Synchronize();
}