How to port a bge mac game to windows?

I’m currently in the process of developing an indie horror game made entirely using blender. Just one problem: I have a mac, and because of that can only export the game as a .app file, meaning windows users cannot use it. This is a big problem since the majority of gamers use windows, and therefore only a select few people could play the game. Any way to port it to windows or something?

Game Publishing addon enables you to export to Windows, OSX or Linux from any of those platforms

Really? Gee, I feel so dumb XD

um… however… how exactly do I choose which platform I want to export to? :o

oh… thanks!