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To determine the document format
Open the document whose format you want to determine. See Open for more information.
Use the DocumentType or DocumentFormat property to determine the format.
DocumentType property returns the format as a text description, such as "Microsoft Word for Windows". The
DocumentFormat property returns the format as a numeric value. These properties are set to the document format regardless of whether the document can be viewed.
To get the general class to which the currently opened document belongs, use the DocumentClass property.