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The name of a file containing an existing class definition, or the name of a file to which a newly created class definition will be saved.
To design a new custom class, or modify a stock class, set the filename property to the name of the file under which the class definition will be saved. While designating a filename, when initially creating a custom class, is not required, a filename must be assigned before the class definition can be saved. Calling the save( ) method, without first setting the filename property, will open a Save As dialog.
When modifying an existing custom class, the filename property will be set by the loadObjectFromFile( ) method.