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Post by Justin_Romile on Thu May 13, 2010 11:00 am

Windows NT comes with two "command line shells" -- one called CMD.EXE and the other called COMMAND.COM. If you're wondering which one to use, following information might help:

CMD.EXE is the Windows NT's native command prompt (or shell), which means it is more portable among different hardware platforms. For example, if you type SET and press ENTER inside a CMD.EXE prompt, you'll notice that CMD.EXE exposes more environment variables than COMMAND.COM. On the other hand, COMMAND.COM is the more "MS-DOS compatible" version of the two shells. For example, this shell will call AUTOEXEC.NT and CONFIG.NT (located in the SYSTEM32 directory inside your Windows NT directory) just like MS-DOS used to call AUTOEXEC.BAT and CONFIG.SYS.

So, if you're having trouble running your old DOS command line programs from Windows NT, try running them inside a COMMAND.COM shell, not CMD.EXE.

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