Allows you to choose a SmartPlant Markup Plus default viewer or define an external application to display files of a particular type. This menu appears when you right-click on a file type on the File Type Associations dialog box or the File Type Associations tab of the Options dialog box.
Default - Indicates that SmartPlant Markup Plus will be used to view files of the selected type and that the application's internal logic will select the appropriate viewer.
Open with - Accesses the Open with dialog box, from which you may select an external application with which to view the selected type of file.