try {
String fileName = (String) fileNameSelectionList.getSelection();
File showFile = fileName != null ? new File(attachmentDir.getAbsolutePath() + "/" + fileName)
: null;
DesktopUtil desktopUtil=new DesktopUtil();
desktopUtil.openFile(showFile, window);
} catch (DesktopException e) {
throw new ProTransRuntimeException(e.getMessage());
}
}