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Use Disk Cleanup:

Games built on engines like Unity or Unreal Engine often populate their cache folders with files named via MD5 hashes (e.g., b7ef81a9.bin ). b7ef81a9.bin

Based on user reports on malware forums (e.g., BleepingComputer, Malwarebytes), b7ef81a9.bin is most likely: Use Disk Cleanup: Games built on engines like