Is there a lesson/tutorial out there on how to unpack packages meant for Unity? I'd hate to have to learn a new software just to extract some of the files.
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You'd have to have Unity installed to unpack a Unitypackage, with Unity installed have a Project open and double click on the package and it should import the files to Unity. I don't know if there's Unitypackage converter for Cinema4d, I've heard there's one for Godot, but I don't know much more than that.