title: how to open a 'csv file' like 'url launcher' in Flutter
body: <p>i converted  list into File of .csv extension then
   tried <strong>OpenFile.open</strong> and ended up with error <code>No permissions found in manifest for: 2</code>, tried <strong>canLaunch</strong> and ended up with error <code>name.csv exposed beyond app through Intent.getData(), Failed to handle method call</code></p>
  
  <p>so how to open that csv file in any 3rd part application.</p>