put url tricks to copy files on windows

[Mike Kerner]

I'm trying to use the put url technique to copy files on windows, but I'm
getting "can't open file"
If I do something like
answer line 1 of url ("binfile://"&filename)
I get what I expect, but when I try to
put url ("binfile://"&filename) into url ("binfile://"&toFilename)
I get "can't open file" in the result

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