title: Customise FileOpenPicker in UWP
body: <p>I have a sub folder in downloads folder named 'StudentDetails'. It contains subfolders with student names.And each student name contains images related to that student.
  By default, I want to open that StudentDetails folder (OnSuggestedStartLocation not reach the goal). And it should list all student name on left side. When user clicks on each student name corresponding files should show on right side. Is it possible on uwp?</p>
  
  <pre><code>        FileOpenPicker openPicker = new FileOpenPicker();
          openPicker.ViewMode = PickerViewMode.Thumbnail;
          openPicker.SuggestedStartLocation = PickerLocationId.Downloads;
  
          foreach (string extension in FileExtensions.Video)
          {
              openPicker.FileTypeFilter.Add(extension);
          }
  
          file = await openPicker.PickSingleFileAsync();
  </code></pre>