PStore#on_windows?

# File tmp/rubies/ruby-3.3.0/lib/pstore.rb, line 667
def on_windows?
  is_windows = RUBY_PLATFORM =~ /mswin|mingw|bccwin|wince/
  self.class.__send__(:define_method, :on_windows?) do
    is_windows
  end
  is_windows
end