4.0M Operating System DOS Microsoft MS-DOS 4.0M (Disk 1) ANSI.SYS AUTOEXEC.BAT BIN ASSIGN.EXE CHKDSK.EXE COMMAND.COM DISKCOPY.EXE DISKCOPY.PIF FDISK.EXE FORMAT.EXE JOIN.EXE MODE.EXE SM.EXE SM.PIF SUBST.EXE SWAPPER.DOC SWAPPER.EXE SWAPPER.PIF SYS.EXE COM.SYS COMMAND.COM CONFIG.SYS EGA.SYS HE_DAEM.EXE HE_DAEM.PIF IBMBIO.COM IBMDOS.COM POPUP.EXE POPUP.PIF RAMDRIVE.SYS README.TXT MS-DOS 4.0M (Disk 2) APPEND.EXE ATTRIB.EXE BACKUP.EXE EDLIN.EXE FC.EXE FIND.EXE KEYBDV.EXE KEYBFR.EXE KEYBGR.EXE KEYBIT.EXE KEYBSP.EXE KEYBUK.EXE LABEL.EXE LINK4.EXE MORE.EXE PIFEDIT.EXE PRINT.EXE QUEUER.EXE RECOVER.EXE RESTORE.EXE SORT.EXE Disk 2 with unpatched LINK.EXE The designation "4.0M" is not an official version number; we use it only to differentiate this version of MS-DOS from the "non-multitasking" version.