Attached files are not usually text files like the E-mail message itself, instead they are usually binary files with a specific internal format for a specific software and must be encoded before they are sent. Please note that incoming attachments will be located in a separate directory or file system then the Email. Only when necessary. Keep your recipient in mind when sending attached files. They may not be running the same kind of software as you, and handling the attached file may be cumbersome.
Attachments usually require the recipient to do something extra to get to the information.
Whenever possible, remove the formatting by saving the file as a text file or by cutting and pasting into the message portion of the E-mail message instead of sending a file attachment. When the content of the file is formatted in such a way that cutting and pasting is either too cumbersome or the content loses meaning with the formatting. You should always choose a format that is compatible for your recipient. When in doubt, refer to the file extension standards . That depends on the E-mail software you use.