+ is special to copy. It's used to tell copy to concatenate files. 

copy a+b c

[download]

Quote the file name. 

copy "a+b" c

[download]

During this copy files containing + in filename creates extra directory

copy doesn't create directories.

In reply to Re: Any issue with copy of file where filename contains + sign? by ikegami
in thread Any issue with copy of file where filename contains + sign? by Anonymous Monk

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