public FileValue defineFile(String name, File defaultValue, File startingDir) {
		checkDup(name);
		FileValue value =
			new FileValue(name, defaultValue, startingDir, GhidraFileChooserMode.FILES_ONLY);
		valuesMap.put(name, value);
		return value;
	}
Defines a value of type File
@param name the name for this value
@param defaultValue an optional initial value
@param startingDir specifies the starting directory when the FileChooser is invoked
@return the new FileValue that was defined
Ghidra/Framework/Docking/src/main/java/docking/widgets/values/GValuesMap.java