Drag/drop from outlook to internet explorer via BHO doesn't work on x32/86 machines

I'm currently implementing a browser helper object which would allow dragging emails from the outlook to the internet explorer's page.

I'm following the approach described in the following post: Implementing a Drag-and-Drop function from MS Outlook into our web application. I've got it working but only on x64 machines. On the x32/86 machines i'm getting the exception in the following piece of code (obviously i've replaced real filename inserting with fake one for simplicity):

DropFiles df = new DropFiles();

string filename = @"D:\projects\hello.txt";
byte[] binaryData = Encoding.Unicode.GetBytes(filename);

binaryData = binaryData.Concat(new byte[] { 0, 0 }).ToArray();

IntPtr pointerToGlobalMemory = Marshal.AllocHGlobal(Marshal.SizeOf(df) + binaryData.Length);

df.Files = Marshal.SizeOf(df);
df.Wide = true;
Marshal.StructureToPtr(df, pointerToGlobalMemory, true);
IntPtr newPointer = new IntPtr(pointerToGlobalMemory.ToInt32() + Marshal.SizeOf(df));

Marshal.Copy(binaryData, 0, newPointer, binaryData.Length);

var descriptorFormat = new COMInterop.FORMATETC();
descriptorFormat.cfFormat = HdropDescriptorId; // 15
descriptorFormat.ptd = IntPtr.Zero;
descriptorFormat.dwAspect = COMInterop.DVASPECT.DVASPECT_CONTENT;
descriptorFormat.lindex = -1;
descriptorFormat.tymed = COMInterop.TYMED.TYMED_HGLOBAL;

var td = new COMInterop.STGMEDIUM();
td.unionmember = pointerToGlobalMemory;
td.tymed = COMInterop.TYMED.TYMED_HGLOBAL;

dataObject.SetData(ref descriptorFormat, ref td, true);

On the executing the last ling of this code (actually setting the fake HDROP descriptor) i'm getting the following exception: "Invalid FORMATETC structure (Exception from HRESULT: 0x80040064 (DV_E_FORMATETC))".

Did someone experienced described problem or have an idea what can be the reason of this issue?

To be more specific about environment - i'm having this trouble on win7 32 bit with IE 10 but i'm pretty sure that the reason especially in that machine is 32 bit.

You need to implement your own IDataObject and pass it to the original IDropTarget.Drop instead of hijacking an existing IDataObject coming from Outlook.