# -- file dialog
	my $types = [ ['PNG files', '.png'],
				  ['All Files',   '*'],];
	my $output_path = $mw->getSaveFile(
		-filetypes => $types, 
		-initialfile => time2str("%Y-%m-%d", time()) . '-export',
		-defaultextension => '.png',
	);
	
	return 0 unless $output_path;