A file extension, or file name extension, is the letters immediately shown after the last period in a file name. For example, the file extension.txt has an extension of .txt. This extension allows the ...

A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...

Dozens of fancy point-and-click task managers promise to organize your to-do list, but so often power users find that nothing outdoes that trusty old classic: the todo.txt file. If you're a command ...