code: def build_filename(self, binary):
          
          template = '%(APP)s-%(VERSION)s.%(LOCALE)s.%(PLATFORM)s%(STUB)s' \
                     '.%(EXT)s'
          return template % {'APP': self.application,
                             'VERSION': self.version,
                             'LOCALE': self.locale,
                             'PLATFORM': self.platform,
                             'STUB': '-stub' if self.is_stub_installer else '',
                             'EXT': self.extension}
docs: Return the proposed filename with extension for the binary.