Up-param.bin

This wasn't a driver. It was a configuration file for the tether’s counterweight. But why was it hidden in a subfolder of a defunct weather satellite?

The .bin extension is a dead giveaway that this is a human-readable text file (like JSON or YAML). It is a binary serialization format , most commonly produced by PyTorch’s torch.save() function or NumPy’s .tofile() method. up-param.bin