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The SYMBOL_DESCRIPTION_FILE can be named anything, but is typcially named symbolOrder.txt or symbolOrder.csv. If the user wants to experiment with a new symbol layout, they can copy the existing file and change the name and then select the new one using the file browse button.
EXPANDED SYMBOL DESCRIPTION FILE
If the SDL SDL in the SYMBOL_DESCRIPTION_FILE contains LOOP_DIRECTIVES, PartBuilder will create an expanded copy of the file prefixed with exp_{file_name}. The user should be careful not to edit the expanded file because it gets regenerated each time the MAP_PINS_TO_SYMBOLS operation is run. The expanded file is a good place to look to make sure the SDL LOOP_DIRECTIVES are doing what they are intended to do. The expanded file may be has been moved to the OUTPUT_FILES directory in a future version of the tool to avoid confusion.
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