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Bug introduced in 5.2 or earlier and persisting through 11.2.0
The bug appears on Windows only


I want to rename a .txt file.

For example create a file on your Desktop and name it use TEST.TXT, now I want to rename it to test.txt:

RenameFile["C:\\Users\\Administrator\\Desktop\\TEST.TXT",
           "C:\\Users\\Administrator\\Desktop\\test.txt"]

It seems that RenameFile does not distinguish the UPPER CASE from the lower case in the file extensions. So how can I rename this file?

Ps: I use MATLAB in my homework, but MATLAB can only read *.m in terms of *.M files. So I must rename the *.M files. Therefore I use *.TXT and *.txt to make a example.

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  • $\begingroup$ Works like a charm for me on Linux. $\endgroup$ – Öskå Sep 30 '14 at 13:58
  • $\begingroup$ I suspect this is an OS problem, since Windows, by default, does not utilize a case-sensitive filesystem, although there are some exceptions. $\endgroup$ – bobthechemist Sep 30 '14 at 14:09
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    $\begingroup$ I am very happy to learn Mathematica as well as English at the same time here.*^_^* $\endgroup$ – partida Sep 30 '14 at 14:23
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    $\begingroup$ Glad to know there is a workaround, but this ought to be reported to wolfram support. $\endgroup$ – george2079 Sep 30 '14 at 19:37
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    $\begingroup$ @bobthechemist I don't think this is the problem of windows. windows cmd has ren function which has no problem rename upper case to lower case. I think this is apparently a bug. Latest 11.2 still has this problem. $\endgroup$ – matheorem Oct 22 '17 at 2:39
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A simpler alternative:

winRenameFile[f1_, f2_] := Module[{}, RenameFile[f1, "pre" <> f1];
  RenameFile["pre" <> f1, f2]]
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  • $\begingroup$ Crap, that is much simpler. $\endgroup$ – kale Sep 30 '14 at 14:15
  • $\begingroup$ Ok! Words like a charm in my computer! Thank you everyone! $\endgroup$ – partida Sep 30 '14 at 14:31
  • $\begingroup$ @user15961 Works* :) $\endgroup$ – Öskå Sep 30 '14 at 17:52

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