hstr (HSTR)

      File handle.

    usOperation (USHORT)

      Flags.

      DF_MOVE

        The operation was a move. If this flag is not set, the operation was a copy.
      DF_SOURCE
        The receiving window was the source of the drag. If this flag is not set, the receiver was the target of the drop.
      DF_SUCCESSFUL
        The drag operation was successful for the file. If this flag is not set, the operation failed.

      ulReserved (ULONG)

        Reserved value, should be 0.

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