engine migration in main application in rail 2.3.2 on window

Hello all,

I am developing a small rails engine. using rails 2.3.2 version on
windows OS

I followed steps from railscast video.
"http://media.railscasts.com/videos/149_rails_engines.mov"

I am stopped at how to do migration from rails engine to main
application

in railscasts video they given a rake task like

but this task is not for windows environment.