Since the first version of MS-DOS operating system announced by Microsoft in 1981, a sequence of versions appeared until 1993, where the sixth version become available. MS-DOS Version 6.0 has been studied carefully. The study includes some other operating systems mainly unix, to see what new commands are necessary to be added, and what existed commands require enhancement in MS-DOS V 6.0. This work includes 11 commands, seven of these commands are new external commands, while others are enhancing to already existed commands. Those commands covers the following directions: Director/ and Files Management. Multitasking. Dealing with unix files. Others. All commands are written using Assembly 8088 and tested succesfully on ibm or compatible microcomputers. Also, , all those commands are run smoothly on all versions of MS-DOS starting from version 2.0.