Popen4 gem for windows

hi, i want to make application that run a process automatically after
server
starts completely.
I have explore and find popen4 gem which provides this facility.
I have installed a gem but there is some problem while executing the
ruby
program.
The error is like

  • internal:lib/rubygems/custom_require:29:in require': no such file to load -- win32/open3 (LoadError)* * from <internal:lib/rubygems/custom_require>:29:inrequire’
    from
    C:/Ruby192/lib/ruby/gems/1.9.1/gems/POpen4-0.1.4/lib/popen4.rb:9:in
    <top (required)>' from <internal:lib/rubygems/custom_require>:33:inrequire’
    from internal:lib/rubygems/custom_require:33:in rescue in require' from <internal:lib/rubygems/custom_require>:29:inrequire’
    from sample2.rb:2:in `’*

can anybody suggest me how to install this gem? my platform is windows 7

It is require ‘open4’ not open3. You are requiring the wrong gem

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