How to change Windows icon?

I remember reading a while back that the TGB icon could be changed to your game's custom icon by recompiling using Visual Studio. Somehow I messed up my Visual Studio project, and due to my many source code modifications, it'd be a pain to get it to compile again. I'm wondering if there's a way to change the windows icon without recompiling the project. Surely there must be a way, since those who don't own the Pro version of TGB must be able to change it, right?

I'm rather Windows-illiterate, so thanks in advance! I don't mind if I need some 3rd party shareware program to do it.