Can't build/run managed samples on x64

Hi all,

I just downlaoded and installed the Dec 2005 bits. I can build and run the managed C# samples just fine on my 32-bit machine, but no luck with my x64 machine.

When I build the default SimpleAnimation sample, it buildes fine, but gives me this error when I run:

System.BadImageFormatException was unhandled
Message=" is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)"
Source="mscorlib"
StackTrace:
at System.Reflection.Assembly._nGetEntryPoint()
at System.Reflection.Assembly.get_EntryPoint()
at Microsoft.VisualStudio.HostingProcess.HostProc.GetEntryPointAptThreadState(String assemblyFile)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunParkingWindowThread()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

When I remove references to the the Microsoft.DirectX.Direct3D and Microsoft.DirectX.Direct3DX assemblies, and substitute the 64-bit version of Microsoft.DirectX, I get build errors like this:

Error 1 The type or namespace name 'Caps' could not be found (are you missing a using directive or an assembly reference ) E:\dev\Microsoft DirectX SDK (December 2005)\Samples\Managed\Common\dxmutdata.cs 28 33 SimpleAnimation_2005

Here's my configuration:

HP xw8200 workstation with XP Pro x64 Edition, VSTS RTM, 2GB RAM.

I'm sure I must be missing something obvious...any help apprecitated.

Jim