Map menu command

I would like to map a few menu commands.

p.e.

A menu command is:

an <silent> 10.330 &File.&Close<Tab>:close
\ :if winheight(2) < 0 <Bar>
\ confirm enew <Bar>
\ else <Bar>
\ confirm close <Bar>
\ endif<CR>

How can I map this command to a shortcut (ctrl-w)?

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