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.
NOTE: Various hardware devices, such as smartphones and the Amazon Kindle, and web browsers, such as Chrome and Firefox, also recognize plain text files.
Common TXT Filenames:
New Text Document.txt - The default filename Microsoft Windows gives to new text documents created via the context menu (right-click on the desktop and choose ).
README.txt - A text file commonly included with software installers that provides information about the software. Users should often read this file before using the software.