The dataflow file is a portable representation of your data model. It contains all the operations and parameterization, which constitute the algorithm designed through your modeling process. It does not retain the values that pertain to the actual running of the dataflow. You must supply those values after uploading the dataflow file into a dataflow.
The actual file is an archive file whose contents can be viewed with any tool that supports looking into .tar.gz files. The content of the files should not be modified.