Gets or sets metadata recognized as the type of the content, defined by a specific use and intended audience (Whitepaper, Security Bulletin, Exam etc.)
The ContentType property allows you to specify one of the core document properties, a full set of which is available with the Document.DocumentProperties property. To specify a custom document property, use the Document.CustomProperties property.
The ContentType property is excluded from core properties in ECMA-376 4th edition (December 2012). It is supported in DOCX documents only.