If you use the Pervasive SQL Control Center you can write a SQL update query for the range.
 
Of course, that does require a bit of knowledge of SQL and should be tested with select queries to see that you're getting the items you are trying to update. Proceed cautiously. With that disclaimer in mind, I use this direct method a several times each year when wholesale chances need to be made and no Evo tool exists to get 'er done.