code: def write(self):
          
          filters = {
              'MSGUID': lambda x: ('{%s}' % x).upper(),
              'relslnfile': lambda x: os.path.relpath(x, os.path.dirname(self.FileName))
          }
          context = {
              'sln': self
          }
          return self.render(self.__jinja_template__, self.FileName, context, filters)
docs: Writes the ``.sln`` file to disk.