Why do you need to run os.execute first to have ansi colors in the windows console

os.execute [[echo "Why do you need to run os.execute first to have ansi colors in the windows console?"]]

for i = 1, 107 do
    print (string.format("%d\tESC[%dm test ESC[0m",i, i))
end

-- This makes colored output for the windows console
-- notes
--  I used notepad++; using the alt code types in a single character which displays as ESC
--  If you paste the code from this pastebin, colors will not work
--  You need to use ALT + 0 2 7 wherever I write ESC
-- some examples:
-- underline: ESC[4m UNDERLINE ESC[0m
-- underlined green: ESC[4;32m UNDERLINE ESC[0m
-- green: ESC[32m GREEN ESC[0m
-- red:   ESC[31m RED ESC[0m