Standard text document that contains unformatted text; recognized by any text editing or word processing program; can also be processed by most other software programs.
Generic text files with filenames that ending in ".txt" are created by Notepad for Windows and by TextEdit for Mac OS X when document formatting is removed.
Various hardware devices, such as smartphones and the Amazon Kindle also recognize plain text files.
Program(s) that open txt files
Mac: Apple TextEdit; Bare Bones Software BBEdit; MacroMates TextMate; Microsoft Word; Any text editor Windows: Microsoft Notepad; Microsoft WordPad; Microsoft Word; Helios TextPad; Notepad++; Notepad2; Any text editor
Unix: Leafpad; gedit; KWrite
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/txt
