ocr: PREFERENCE FILE Function Description A Custom Symbols, Icons, text and line defaults may be saved in a separate Preference File for use with other documents. - TopDowne.Pref contains the defaults that TopDowne will read when a new document is created. TopDowne looks for this file in the same folder as the application and in the System Folder. 1 You can open an existing Preference File or request that TopDowne re-open the TopDowne.Pref file.