Methods, systems, and products for including a content-description file in a viewable aggregate file. A content-description file that has a first native file format and a second file that has a second native file format are identified and are inserted into an aggregate file in a form that preserves the first and second native file formats. The content-description file and the second file are extractable from the aggregate file in their respective native file formats. The content-description file is extractable without processing any part of the second file, and the second file is extractable without processing any part of the content-description file. An indication is provided for the aggregate file that indicates a default behavior for when the aggregate file is opened for viewing.