All electronic documents have an extension that identifies what type of file it is.
When you are sending attachments electronically, please remember that the recipient must have a program that can open the file type that you send. All word processing programs can open and read .txt files. Unfortunately, txt files have no formatting, so headings, columns, tables, fonts are not preserved. This file type can be read by most word processing programs, and your formatting of the document is preserved. See how to create an rtf file below.