Format Textual format http://filext.com/file-extension/TXT Data in text format can be compressed into binary format, or can be a value of an XML element or attribute. Markup formats are not considered textual (or more precisely, not plain-textual). http://www.iana.org/assignments/media-types/text/plain beta12orEarlier Plain text format http://www.iana.org/assignments/media-types/media-types.xhtml#text Textual format. txt Binary format