Here's our Microsoft Office Tip for.. January 26, 1999
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Beware copying files from a Command Prompt
If you sometimes use the command prompt, here's a problem you may not know about. When you use the Copy command at the Windows NT 4.0 command prompt, it will fail to warn you when you're about to copy over a file of the same name. It will simply overwrite the existing file.

This is a bug, and Microsoft will probably announce a fix one of these days. In the meantime, just make sure what files are in the target folder before you start copying.