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7zip is open source and it handles .rar. And in the Sins community at least .7z files are the second most common type of compressed file, behind .zip of course.
But again, you don't actually have to extract the Galaxy Forge for Rebellion, it is already installed.
Path was C:\Program Files\Steam\steamapps\common\Sins of a Solar Empire Rebellion\Galaxy Forge\GalaxyForge.exe