One could want/need to copy a file to a file with no extension like test.txt to test.

Imho copying a file to a folder but not using the last \ should be interpreted as copying a file to a file. If you want to copy to a folder you should always use a trailing \. So imho the current (4.60) behaviour is not correct.
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Mart

- Chuck Norris once sold ebay to ebay on ebay.