Can't use rails_upgrade plugin on Windows due to missing fork() function

I'm on Windows....and I can't get anything to work with this plugin: http://github.com/rails/rails_upgrade

If I run rake rails:upgrade:check, for example, I get this:

rake aborted! fork() function is unimplemented on this machine

What a drag! I heard that Ruby's fork() function is unimplemented on Windows... DOES THAT MEAN I CAN'T USE THE PLUGIN?

If you have any insights, please helpppp!

Ruby's fork() function isn't "unimplemented" on windows, fork() is an function provided by the OS on Unix and Unix-like OS'es (e.g. Linux, OS X, etc, etc.)