This is a dictionary which maps property ID values to property ID strings.
in 4.0.0, there's no way to create custom PropertyIDMaps, therefore this class is obsolete
Support classes for "well-known" section format IDs and property IDs. The streams \005DocumentSummaryInformation and \005SummaryInformation (or any streams with the same section format IDs as the aforementioned) are considered well-known. So are most property IDs in these streams.
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