Main Page | See live article | Alphabetical index TXT is a computer file extension for text files - ie., without any formatting data stored in the file. Usually the data is encoded in ASCII but also can be stored in Unicode as well. TXT is also an abbreviation used by the cellular telephone network Vodafone for SMS messages. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.