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Two Command Line Shells
Before Windows NT there was only one version of DOS and one command to access it, command.com. But Windows NT and all Windows operating systems since use cmd.exe as there native command line shell while still including command.com for backwards compatibility.
Better MS-DOS Compatibility
Normally, if you are using Windows NT, 2000, XP, 2003 or later you will want to use cmd.exe as you 'DOS' program. But if you are running some old 'MS-DOS' style command line programs or batch files and they do not work, try using command.com instead.
Ref: H_DOS_VERSIONS
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