Microsoft KB Archive/825412

= &quot;Duplicate Filename or File In Use&quot; Error Message When You Rename a File in MS-DOS =

Article ID: 825412

Article Last Modified on 2/8/2005

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APPLIES TO


 * Connectix Virtual PC for Mac 5.0
 * Connectix Virtual PC for Mac 6.0
 * Microsoft Virtual PC for Mac Version 6.1
 * Microsoft Virtual PC for Mac Version 6.1.1 Update
 * Microsoft Virtual PC for Mac Version 7 with Microsoft Windows 2000 Professional
 * Microsoft Virtual PC for Mac Version 7 with Microsoft Windows XP Home Edition
 * Microsoft Virtual PC for Mac Version 7 with Microsoft Windows XP Professional
 * Connectix Virtual PC for Windows 4.0
 * Connectix Virtual PC for Windows 4.1
 * Connectix Virtual PC for Windows 4.2
 * Connectix Virtual PC for Windows 4.3
 * Connectix Virtual PC for Windows 5.0
 * Connectix Virtual PC for Windows 5.1
 * Connectix Virtual PC for Windows 5.2
 * Microsoft Virtual PC 2004

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SYMPTOMS
In an MS-DOS virtual machine, when you use the REN command to rename a file by using a different case, you may receive the following error message:

Duplicate filename or file in use

For example, you receive the error message when you try to rename a &quot;TEST.TXT&quot; file to &quot;test.txt,&quot; by using the following command: Ren TEST.txt test.txt

Note In this error message, the word &quot;filename&quot; is a misspelling for the words &quot;file name.&quot;



CAUSE
This behavior occurs because file names are not case-sensitive in MS-DOS. When you use lowercase letters in a file name, the letters are automatically converted to uppercase. Therefore, you cannot rename TEST.TXT to test.txt.



Keywords: KB825412

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