private void setLastExportDirectory(File file) {
		Preferences.setProperty(Preferences.LAST_EXPORT_DIRECTORY, file.getParent());
		Preferences.store();
	}
Construct a new ExporterDialog for exporting a program, optionally only exported a
selected region.

@param tool the tool that launched this dialog.
@param domainFile the program file to export. (may be proxy)
@param domainObject the program to export if already open, otherwise null.
@param selection the current program selection (ignored for FrontEnd Tool).
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/exporter/ExporterDialog.java