Horizon's Halo reach game type mod?

Does anyone know how to actually work this and can teach me? Because I cannot figure this modding tool out for the life of me, I don’t know if there’s any of files I need to make this work or anything like that. Much appreciated if anyone can help me out with this.

Could you post a screenshot of what the tool looks like when you open it?

Judging from the name I’m guessing the tool is used to either make or import/export custom game type files.

Yupp, looks like import/export with some editing capabilities, possibly advanced plain text editing instead of pressing buttons or checking boxes.

I haven’t used the tool but you will probably be able to do the same thing it does in the more user friendly in-game editor.