what is a TWPRTFExtraDataMode?

what is a TWPRTFExtraDataMode, and how do I use it in RTFVariables.Find?

I can find no documentation on this anywhere. It does not seem to be optional.

I do find the following. However, the unit mentioned does not seem to exist in my version of wptools. The type is not recognized, and neither are the 2 values.

Unit
WPRTEDefs

Declaration

TWPRTFExtraDataMode = (wpxText, wpxData);