Open with a selected file (reissued)

I have upgraded to 3.0.9 and I got it working again.
I have discovered a typo though, that didn't prevent the page to load in the previous versions but in the new 3.0.9 one it does:

The typo is in the next section of issue: 3227188 →

Following code added:

Item.isTextSource = function() {
    return this.ext && this.ext.toLowerCase() === 'txt'; */ add formats as you need after 'txt'; add a coma and another extension, eg.: 'txt', 'csv' */
  };

where it says */ add it should say /* add, the asterisk on the other side of the bar.