I'm copying a large directory structure from a web server to Windows.
This is not for the common reason that I need to install SMB 1.0/CIFS like so:
It appears this is a common error message with many different causes.
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Check for duplicate names where only the case of the letters is different.
It turns out that I had two directories with the same name, only the case was different!
On Linux, these are different directories. On Windows, they shouldn't exist separately. Copying them from a Linux share caused this error.