Is "Enable 32-Bit Applications" to "TRUE required on IIS with TFS 2010 SDK?

Hi

We have TFS 2010 64-bit installed.  We are trying to create a Web application to create custom WorkItems.

I have referenced Microsoft.TeamFoundation.WorkItemTracking.Client.dll and Microsoft.TeamFoundation.Client.dll.  They are version 10.0.0.0.  When I publish to IIS, it also copies Microsoft.TeamFoundation.WorkItemTrakacking.Client.Cache.dll, Microsoft.TeamFoundation.WorkItemTrakacking.Client.DataStore.dll, and Microsoft.TeamFoundation.WorkItemTrakacking.Client.RuleEngine.dll.  They are version 10.2.0.0 - I assume that is the VS2010 SP1?

When we run in 64-bit apppool in IIS, we get BadImageFormatException: An attempt was made to load a program with an incorrect format.  We can solve the problem by enabling 32-bit applications in the AppPool.  We can also solve the problem by deleting the 3 "extra" DLLS: Cache, DataStore, and RuleEngine.

So my question is: Is 32-bit application support required to use TFS SDK on the server in custom ASP.NET application?

Or if not, how do we configure a pure 64-bit application?

var credential = new NetworkCredential(userName, password, domain);
var projects = new TfsTeamProjectCollection(new Uri(serverUrl), credential);
projects.EnsureAuthenticated();
var store = new WorkItemStore(projects);
var project = store.Projects[projectName];

var item = new WorkItem(project.WorkItemTypes["bug"]);
item.Title = "My Title";
item.State = "Active";
item.Description = "Hello\r\nTFS";
item.Save();