It's a constant declared in the Word type library, usually this in in the folder {
BDS}\Imports folder, depending on the Word version it's probably Word2000 or WordXP. If you don't have that, import the type library yourself (replace Office 8.0 with your office version).
To import the Word type library,
Choose Project|Import Type Library.
In the Import Type Library dialog,
Select Microsoft Office 8.0 Object Library.
If Word ( Version 8 ) is not in the list, choose the Add button, go to Program Files\Microsoft Office\Office, select the Word type library file, MSWord8.olb choose Add, and then select Word ( Version 8 ) from the list.
In Palette Page, choose Servers.
Choose Install.
The Install dialog appears. Select the Into New Packages tab and type WordExample to create a new
package containing this type library.