For Microsoft Windows, OS/2, and DOS, .exe is the filename extension that denotes a file as being executable – a computer program – containing an entry
command-line interpreters COMMAND.COM and cmd.exe on DOS, Digital Research FlexOS, IBM OS/2, Microsoft Windows and ReactOS operating systems to clear the screen
computing, start is a command of the IBM OS/2, Microsoft Windows and ReactOS command-line interpreter cmd.exe (and some versions of COMMAND.COM) to start