On windows, you'll need to update a property in the cordova.properties file from:
Aside from that, the paths in the properties file use forward slashes which you might want to use too. I think windows is pretty forgiving on that.
I have only tested this project on mac but I think it should be fine on windows given these slight modifications.
Just make sure that before you build again that you delete any of these files from the root of your sencha root that might be there. You'll need to do this for subsequent builds too:
I should probably update the project to detect the OS and choose the appropriate create script, it's easy enough.