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I opened Command Prompt and entered the following command:
and got the following answer:

Invalid number of parameters

The path to %AppData%\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar exists

Whats wrong?

Works for me as is.

Steffen

I got questioned if "test" had to be a file or a directory.
But it worked indeed.

I use Windows 10

Puccilillo

Thank you for comments.

Today I tried to execute the command again.....and it worked.

Very strange.
I have absolute no clue what the reason was.
A missing reboot cannot be the reason. I tried that trick already a couple of does ago.

So ok problem is solved anyway

I have to revert to this question.

meanwhile I found the problem:
Is a System directory.

And Xcopy cannot copy from (this) system directories

When I use xcopy with a normal user directory as source then everything works.
But Command Prompt in general rejects to work with system directories.

Try this basic command:
It fails too

Any chance to bypass this restriction?

Still, both working for me.
What Windows version are you on? Do you have admin rights?