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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.

Bug introduced in 5.2 or earlier, persisting through 11.2.0 and fixed in 12.3 or earlier [CASE:3962020]
_{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.

Bug introduced in 8 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.

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.

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.

Bug introduced in 8 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.