This feature is available in OOXML files (DOCX/DOCM) only. Setting the value to null will clear any existing values. This is the MS Word equivalent of File menu > Info > Show All Properties:   
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//--- Set "Author" Property
WordTemplate wt = new WordTemplate();
wt.Open(@"c:\templates\Template.doc");
wt.SetDocumentProperty(DocumentProperties.BuiltInProperty.Author, "Jennifer WordSmith");
wt.Process();
wt.Save(@"c:\reports\Report.doc");
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//--- Set "Author" Property
Dim wt As New WordTemplate()
wt.Open("c:\templates\Template.doc")
wt.SetDataSource(DocumentProperties.BuiltInProperty.Author, "Jennifer WordSmith")
wt.Process()
wt.Save("c:\reports\Report.doc")
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