On MS-DOS, the command is available in versions 3 and later.[4] The command is also available in FreeDOS,[5]PTS-DOS,[6] and SISNE plus.[7] The FreeDOS version was developed by Ron Cemer and is licensed under the GPL.[8]DR DOS 6.0[9] and DatalightROM-DOS[10] include an implementation of the share command.
Windows XP and later versions include 16-bit commands (nonnative) for the MS-DOS subsystem that are included to maintain MS-DOS compatibility. The share MS-DOS subsystem command performs functions that are now inherent to Microsoft Windows. It is available to preserve compatibility with existing files, but has no effect at the command line because the functionality is automatic. The 16-bit MS-DOS subsystem commands are not available on 64-bit editions of Windows.[11]
