NativeCategory
Specifies the categories of file types or formats for native imaging. Used by NativeType class.
Email = 2
The native type is an email message.
Html = 5
The native type is an HTML document.
Other = 0
The category for the native type isn’t specified.
Presentation = 4
The native type is a presentation format, such as Microsoft PowerPoint.
Spreadsheet = 1
The native type is a spreadsheet.
Unknown = 6
The native type can't be mapped.
WordProcessor = 3
The native type is a word processor document.