What is "IStreamPtr" ?
Is it something that hold "byte data" or can it be?
If so is it possible to write its content to file?
It is a smart pointer class that you got from the #import directive. Derived from the _com_ptr_t class, a wrapper class for COM interface pointers. IStream in this case. Docs are here and here.
Like any pointer type, writing it to a file is not possible. Writing the content of the stream to file is certainly possible.
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