Repacks, like those from FitGirl, are popular in the gaming community because they heavily compress the game files (often from 5GB+ down to ~2GB), making them easier to store or download on slower connections. However, because Stronghold 3 is an older title with a specific engine, modern players often have to use "Compatibility Mode" or community-made wrappers to get it running smoothly on Windows 10 or 11.
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