Bug #4396: windows commands starting with "@" should run at all even though command string is quoted by `"'.
http://redmine.ruby-lang.org/issues/show/4396

Author: Motohiro KOSAKI
Status: Open, Priority: Normal
Category: core, Target version: 1.9.3
ruby -v: ruby 1.9.3dev (2011-02-09 trunk 30831) [i386-mswin32_100]

This issue 

C test program.
------------------------------------------
main()
{
  system("\"@echo foo\"");
}
------------------------------------------

=> foo


Ruby test program.
------------------------------------------
ruby -e 'p system("\"@echo foo\"")'

=> nil


----------------------------------------
http://redmine.ruby-lang.org