add a 420mb .exe to the project, adds almost 900mb to the size of the installable

We have a custom action set up to install a second .exe that's 420mb. It works fine except that now the project jumped up to a 1gb in size. This makes it a large file that is very slow to install. Any ideas why it seems like InstallShield is including the second .exe file twice? The only other files we have added to the project are less than 2mb in size.

Is there a step by step on how to install a second program with the same installable so I can see where I went wrong?