public String getOutputFileExt() {
		switch( outputFormat ) {
			case txt: return ".txt";
			case rtf: return ".rtf";
			case docx: return ".docx";
			case xlsx: return ".xlsx";
			case pptx: return ".pptx";
			case pdfSearchable:
			case pdfTextAndImages: return ".pdf";
			case xml: return ".xml";
		}
		return ".ocr";
	}