11.   The service includes a special e-mail message with an attached audio file greeting from Santa.

12.   To avoid incompatibility problems altogether, some technology experts recommend purchasing software that lets you view attached files of myriad types without having to open them.

13.   When a user opened the attached file, it destroyed data on the hard drive.

14.   While not all programs understand embedded pictures, most of them can handle attached files.

15.   You can also purchase utility software that will translate and open most kinds of attached files.