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CRTL, vwprintf, Return Values
 *Conan The Librarian 

    x                  The number of wide characters written, not
                       counting the terminating null wide character.
    Negative value     Indicates an error. Either n or more wide
                       characters were requested to be written, or a
                       conversion error occurred, in which case errno
                       is set to EILSEQ.
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