Returns the contents of this property set stream as an input stream. The latter can be used for example to write the property set into a POIFS document. The input stream represents a snapshot of the property set. If the latter is modified while the input stream is still being read, the modifications will not be reflected in the input stream but in the {@link MutablePropertySet} only.
@return the contents of this property set stream @throws WritingNotSupportedException if HPSF does not yet support writingof a property's variant type. @throws IOException if an I/O exception occurs.
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