Trimble Terramodel is a CAD program similar to AutoCAD or BricsCAD and saves a copy of the main drawing file (PRO files in the case of Terramodel, DWG in the case of AutoCAD) and renames the extension ~PR (AutoCAD equivalent is BAK).

Box needs a simple way of toggling the option to ignore certain file types such as these to prevent syn errors and long scanning sessions during sync.