title: File Upload Field in EXT JS
body: <p>I need to implement File Import functionality using EXT JS, I have gone through the examples it were helpful and clear.</p>
  
  <p>Here now i need to import the file of type .txt alone.</p>
  
  <p>For Eg : Once the import pop-up blows, then the "Files of Type should be *.txt"</p>
  
  <p>Please provide the your valuable inputs.</p>
  
  <p>Thanks
  Dinesh Kumar A B</p>