How could you install the files with RAR? I thought they were compressed with 7-zip. Anyway, the file you download is the installer. Doubleclick it rather than open it with a packer. This installation will create a shortcut for you so you can start the game.

The mod appears to run on BI, according to others' posts. Search around this subforum and you'll find out how. It is not supported however. You should run EB on a clean 1.5 RTW installation.