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https://vsatips.com/2015/11/18/whats-filling-up-my-c-drive-i-was-stunned-to-learn-windows-10-secretly-downloads-to-all-windows-7-8-computers/
What's Filling Up My C: Drive? I Was Stunned to Learn Window's 10 Secretly Downloads to all Windows' 7 & 8 Computers