composer/composer — pull request #1903 by jos101 (2013-05-15 16:01:16+00:00)
Title: Enable php_openssl.dll in php.ini

it specifies to enable the extension php_openssl.dll in php.ini. When php_openssl.gll is disabled, the command show an error in the function file_get_contents but not specify that is necesary to enable php.ini.