The association filter is used to designate this program as an available open view for data file objects which have a title that matches one of the association filters which are set. If a data file object matches a filter in a program object or program file object, the title of the program object or program file object will appear in the data file object's Open cascade of its pop-up menu. The wpQueryAssociationFilter method will return the filter string set by the last call to the wpSetAssociationFilter method. The wpQueryAssociationType method can be called to determine which file types are used to associate data file objects to this program object.