[SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]
void System.Runtime.InteropServices.ComTypes.IDataObject.GetData(ref System.Runtime.InteropServices.ComTypes.FORMATETC formatetc, out System.Runtime.InteropServices.ComTypes.STGMEDIUM medium)
{
    medium = new STGMEDIUM();

    Debug.WriteLine("Format requested: " + DataFormats.GetFormat(formatetc.cfFormat).Name);


    if (DataFormats.GetFormat(formatetc.cfFormat).Name == NativeMethods.ShellClipboardFormats.CFSTR_FILEDESCRIPTORW.Name)
    {
        Debug.WriteLine("---- FileDescriptor wird übergeben");
        MemoryStream fdStream = new MemoryStream();
        fdStream.Write(BitConverter.GetBytes(files.Count), 0, sizeof(UInt32));

        NativeMethods.FILEDESCRIPTORW fd = new NativeMethods.FILEDESCRIPTORW();
        fd.cFileName = files[0].FileName;
        fd.nFileSizeHigh = (UInt32)(files[0].FileSize >> 32);
        fd.nFileSizeLow = (UInt32)(files[0].FileSize & 0xFFFFFFFF);

        Int64 fileWriteTimeUtc = DateTime.Now.ToFileTimeUtc();
        fd.ftLastWriteTime = new NativeMethods.FILETIME();
        fd.ftLastWriteTime.nFileTimeHigh = (uint)(fileWriteTimeUtc >> 32);
        fd.ftLastWriteTime.nFileTimeLow = (uint)(fileWriteTimeUtc & 0xFFFFFFFF);

        // FileDescriptor in Memory Stream schreiben
        int fdSize = Marshal.SizeOf(fd);
        IntPtr fdPtr = Marshal.AllocHGlobal(fdSize);
        Marshal.StructureToPtr(fd, fdPtr, true);
        byte[] fdByteArray = new byte[fdSize];
        Marshal.Copy(fdPtr, fdByteArray, 0, fdSize);
        Marshal.FreeHGlobal(fdPtr);

        fdStream.Write(fdByteArray, 0, fdByteArray.Length);
        SetData(NativeMethods.ShellClipboardFormats.CFSTR_FILEDESCRIPTORW.Name, fdStream);
        return;
    }

    if (IsAllowedTymed(formatetc.tymed))
    {
        if ((formatetc.tymed & TYMED.TYMED_ISTREAM) != TYMED.TYMED_NULL)
        {
            medium.tymed = TYMED.TYMED_HGLOBAL | TYMED.TYMED_ISTREAM;

            if (formatetc.cfFormat == NativeMethods.ShellClipboardFormats.CFSTR_FILECONTENTS.Id)
            {
                if (istream != null)
                {
                    medium.unionmember = pointer;
                }
                else
                {
                    istream = new ComIStreamWrapper(File.Open(files[0].FullPath, FileMode.Open));
                    pointer = Marshal.GetIUnknownForObject(istream);
                    medium.unionmember = pointer;
                }
            }

            try
            {
                ((System.Runtime.InteropServices.ComTypes.IDataObject)this).GetDataHere(ref formatetc, ref medium);
                return;
            }
            catch (Exception exc)
            {
                NativeMethods.GlobalFree(new HandleRef((STGMEDIUM)medium, medium.unionmember));
                medium.unionmember = IntPtr.Zero;
                Debug.WriteLine(exc);
            }
        }
        medium.tymed = formatetc.tymed;
        ((System.Runtime.InteropServices.ComTypes.IDataObject)this).GetDataHere(ref formatetc, ref medium);
    }

}