It is painful when you are forced to use Windows as your programming environment. But there comes a rescuer Cygwin. With Cygwin, you have almost all tools that Unix have if install properly.

comment out following these lines

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    #if (/cygwin|mswin|mingw|bccwin|wince|emx/ =~ RUBY_PLATFORM) != nil
      #puts '## Set the codepage to 65001 for Windows machines'
      #`chcp 65001`
    #end

or you will get failed in the process of rake generate