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by jug 3348 days ago
WinSxS (Windows Side By Side) assemblies were introduced to avoid dll hell by allowing Windows to store multiple versions of installed dll's. So even a minor security patch may leave the former version around because other apps may use/expect it. I think that might add some bloat over time? Also Windows Update installer caches. A ton of Windows updates actually leave their installers around in case you want to uninstall them. That can add up! I've seen it easily get to 1-2 GB.