try {
            inputFile =
                    createTempFile("jodextin_" + filePrefix + "_", StringUtil.isNotBlank(extension) ? "." + extension : extension, tempDir);
            final String outExt = getOutputExtension(extension);
            outputFile = createTempFile("cmdextout_" + filePrefix + "_", "." + outExt, tempDir);

            // store to a file
            CopyUtil.copy(in, inputFile);