As far as I can recall this is and always was a "feature" of MS Windows. Filenames with embedded spaces must be within double quotes. Single quotes can not be used. I understand that single quotes had or may still have some meaning in "for" statements in a batch file. I have never had occasion to use this feature and I suspect that most if not all R users will not need it. Added the R bin directory to your path will bypass all these problems.
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