text: ﻿function FileExtension(extension, fileType, canIndex) {
      var self = this;
      self.extension = ko.observable(extension);
      self.fileType = ko.observable(fileType);
      self.canIndex = ko.observable(canIndex);
      self.newExtension = ko.observable(true);
      self.isSelected = ko.observable(false);
      self.errorHtml = ko.observable("");
      self.showError = ko.observable(false)
  }