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NT-based Operating Systems can use .cmd. &nbsp;9x based OSs must use .BAT. &nbsp;There IS a difference, but a very tiny one - unfortunately I don't recall what it is, but I believe it had to do with the interpretation of Command Extensions. &nbsp;(This difference was likely not by design and more of a bug - I'm all but convinced they were supposed to be interpreted identically).<br />
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For general info on the NT Command Shell and Shell Scripting, you might want to check out: <a href="http://www.microsoft.com/technet/prodtechnol/winntas/deploy/shellscr.mspx" rel="ugc nofollow">http://www.microsoft.com/technet/prodtechnol/winntas/deploy/shellscr.mspx</a><br />
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Personally, I almost always use .cmd
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NT-based Operating Systems can use .cmd.  9x based OSs must use .BAT.  There IS a difference, but a very tiny one - unfortunately I don't recall what it is, but I believe it had to do with the interpretation of Command Extensions.  (This difference was likely not by design and more of a bug - I'm all but convinced they were supposed to be interpreted identically).

For general info on the NT Command Shell and Shell Scripting, you might want to check out: http://www.microsoft.com/technet/prodtechnol/winntas/deploy/shellscr.mspx [http://www.microsoft.com/technet/prodtechnol/winntas/deploy/shellscr.mspx]

Personally, I almost always use .cmd

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On my logon scripts ( all clients are XP ) should I use CMD
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On my logon scripts ( all clients are XP ) should I use CMD

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I'd suggest leaving the question open a while and see what others might say.
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I'd suggest leaving the question open a while and see what others might say.

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Whats the diff between *.bat and *.CMD and when would you use one over the other
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Whats the diff between *.bat and *.CMD and when would you use one over the other

batch vs CMD

Microsoft Disk Operating System (MS-DOS) was an operating system for x86-based personal computers, and traces of it are still found in the Windows operating system. DOS is still used in some embedded systems and for certain legacy 16-bit networks.