title: Creating app which opens a custom file extension
body: <p>Want to create an android application, which opens a custom-build file extension (for example, I want to open .abcd files)</p>
  
  <p>It is something like Adobe Reader that opens .pdf files, or Photo Viewer that opens .jpg files</p>
  
  <p><em>Specific conditions:</em><br>
  1. The .abcd file should be outside / external from the application itself. (as .pdf is to Adobe Reader)<br>
  2. The .abcd file would be a zipped file, which contains few folders and .xml, .txt, and .jpg files. I think I want to extract it - maybe temporarily - to somewhere in the storage (definitely need a zipper/unzipper library), then read the individual .xml, .txt, and .jpg files.</p>
  
  <p><strong>Looking for insights and answers for this problem.</strong></p>
  
  <p><em>Additional information:</em><br>
  I am relatively new to Android programming.</p>